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Freephdlabor: Customizable multiagent research automation system

https://freephdlabor.github.io/
1•junyuren•3m ago•1 comments

Show HN: Transmit.dev – A fair, credit-based alternative to CPaaS vendors

1•puches•18m ago•0 comments

How to Harden AI Instances for Privacy and Security

https://techshinobi.org/posts/ai-privacy/
1•techshinobi•19m ago•0 comments

Nvidia Becomes World’s First $5T Company

https://www.ft.com/content/62933c70-261c-4b7a-a045-3f9f9cceccd7
5•sarimkx•24m ago•4 comments

Show HN: NepaliGPT – Open-Source Nepali and English Language Model (MIT

https://huggingface.co/universalml/NepaliGPT-2.0
1•prince_singh•33m ago•0 comments

Jet engine shortages threaten AI data center expansion, wait times into 2030

https://www.tomshardware.com/tech-industry/turbine-shortage-threatens-ai-datacenters-as-wait-time...
1•pabs3•33m ago•0 comments

Show HN: I built a crypto investment platform after losing money guessing

https://investwithclarity.xyz/
1•frukerick•35m ago•0 comments

Trump says South Korea will build a nuclear submarine in the U.S.

https://www.npr.org/2025/10/29/nx-s1-5590230/trump-nuclear-submarine-south-korea
1•bear_with_me•35m ago•0 comments

AI Use Makes Us Overestimate Our Cognitive Performance

https://www.aalto.fi/en/news/ai-use-makes-us-overestimate-our-cognitive-performance
1•jruohonen•40m ago•2 comments

Comparing Claude Code vs. OpenCode

https://www.andreagrandi.it/posts/comparing-claude-code-vs-opencode-testing-different-models/
1•behnamoh•44m ago•0 comments

A Brief History of the Cypherpunk Movement

https://seykhel.org/en/blog/history/
1•suioir•45m ago•1 comments

China's New Influencer Law: Only Degree-Holders Can Discuss Professional Topics

https://www.moroccoworldnews.com/2025/10/265324/chinas-new-influencer-law-says-only-degree-holder...
3•ghssds•52m ago•0 comments

Why is Python's OrderedDict ordered?

https://www.piglei.com/articles/en-why-is-python-ordereddict-ordered/
3•misonic•54m ago•0 comments

Unscreen Pro: Remove Video Background with AI

https://unscreen.pro
1•sparkalpha•58m ago•0 comments

Blank Page Website for Writing

https://focusforge.net
3•chwiho•1h ago•0 comments

Germany examines nationalising Rosneft arm after US sanctions

https://www.reuters.com/business/energy/germany-examines-nationalising-rosneft-arm-after-trump-sa...
3•geox•1h ago•0 comments

Affluent Investors Are Using Options Math to Borrow on the Cheap

https://www.bloomberg.com/news/articles/2025-10-29/trump-and-xi-set-to-formalize-trade-truce-afte...
1•imichael•1h ago•2 comments

Upply – AI that auto-fills any online form

https://goapply.today/
1•longama•1h ago•2 comments

Solving the Character Encoding Issue When Reading DuckDB via ODBC in Excel VBA

https://redraiment.medium.com/solving-the-character-encoding-issue-when-reading-duckdb-via-odbc-i...
1•redraiment•1h ago•1 comments

Show HN: Claim-Detective – Verify Suspicious Tech Claims Collaboratively

https://www.claim-detective.com/
1•stackoversnow•1h ago•0 comments

Trump asks Pentagon to resume testing US nuclear weapons

https://www.reuters.com/world/china/trump-asks-pentagon-immediately-start-testing-us-nuclear-weap...
8•JKCalhoun•1h ago•4 comments

One Year with Next.js App Router – Why We're Moving On

https://paperclover.net/blog/webdev/one-year-next-app-router
6•nnx•1h ago•3 comments

Found a clean subnet cheatsheet website

https://subnetmaskcheatsheet.com
1•chwiho•1h ago•0 comments

Data centers turn to commercial aircraft jet engines as AI power crunch bites

https://www.tomshardware.com/tech-industry/data-centers-turn-to-ex-airliner-engines-as-ai-power-c...
2•pabs3•1h ago•3 comments

Top researchers consider leaving US amid funding cuts:Science world is ending [video]

https://www.youtube.com/watch?v=yLvO070E_dI
5•thelastgallon•1h ago•0 comments

Use the XDG Base Directory Specification

https://xdgbasedirectoryspecification.com/
1•Bogdanp•1h ago•0 comments

GitHub MCP Server now with server instructions, better tools, and more

https://github.blog/changelog/2025-10-29-github-mcp-server-now-comes-with-server-instructions-bet...
2•kordlessagain•1h ago•0 comments

Hello-World iOS App in Assembly

https://gist.github.com/nicolas17/966a03ce49f949dd17b0123415ef2e31
14•pabs3•1h ago•3 comments

No Nvidia Chips Needed Amazon's New AI Data Center for Anthropic [video]

https://www.youtube.com/watch?v=vnGC4YS36gU
1•mgh2•1h ago•0 comments

IRCd service (2024)

https://example.fi/blog/ircd.html
30•pabs3•1h ago•4 comments
Open in hackernews

Floss Before Brushing

https://alearningaday.blog/2025/10/29/floss-before-brushing/
49•imasl42•11h ago

Comments

AznHisoka•10h ago
What about rinsing your toothbrush as you brush? Is there a min number of times you should do so? Just can I just wash it out when i am done?
random3•10h ago
I guess this goes for water pickers use too
rustybolt•10h ago
I stubbornly floss every day and every yearly checkup my dentist tells me it does not help and recommends me to stop doing it.
AznHisoka•10h ago
Maybe your dentist just needs more business? Im half kidding but i once had a dentist that told me I had 4 cavities that needed to be fixed, but when I to a 2nd dentist, she spotted zero cavities
whateveracct•10h ago
Some dentists are way too aggressive about fillings. My dentist keeps a watch on smaller cavities and if they aren't progressing terribly they hold off.
alabhyajindal•10h ago
I have had the exact same experience. Always worth it to get a second opinion before any dental work.
aaronbrethorst•10h ago
That's absolutely happening. https://jacobin.com/2025/07/private-equity-dental-care-healt...
troupo•10h ago
IIRC there were studies saying that flossing isn't as great as people suppose it is.

My completely uneducated guess is that it's marginally useful for people with good teeth (shape, spacing) because debris doesn't accumulate as easily, and brushes are effective.

For my case (crooked teeth, very narrow gaps) it's a great helper to get out the debris, morsels of food etc. that the brush can't get out.

dsego•10h ago
I shared this with HN on many occasions. My wife has crowded teeth, doesn't floss, barely touches her waterpik, doesn't use any proper brushing technique. She probably had a couple of fillings done since I met her 20 years ago. In the meantime I have cavities almost every year, one root canal and a dental implant on a previosly failed root canal. I flossed since university and use mouth rinses and electric toothbrushes and so on. Except for genetics, there are a few differences in our habits throughout the years. I would always brush in the evenings but I was neglecting mornings (somehow I internalized something that a teacher once said that brushing in the morning is silly because you haven't eaten anything). I also drink way too much coffee which is acidic, she doesn't drink any. And lastly, I would at times avoid dentist appointments for years, which probably didn't help.

Edit: I forgot to mention, when I was younger, I used to snore and breathe through my mouth a lot. I think this has also negatively affected my teeth.

troupo•10h ago
Oh, genetics trump everything.
jemmyw•10h ago
You started out good with what seemed like an easy comparison, she doesn't floss, you do, she still has better teeth. But then you go on to show all the other differences, especially not always brushing twice a day, different diet, avoiding dentist, and its hard to understand the point of your post.

My wife and I have an almost identical routine and diet, we use the same brand electric brushes, always twice a day, and usually have coffee together. However, she's not had many dental problems, but I've had to go to the dentist tons this year. Oh, incidentally I also knocked my front teeth out in a cycling accident.

dsego•10h ago
You're right, I lost the plot. I still think it's mostly genetics, just because her hygiene and frequency of dentist visits are comparable to mine. I wish I was keeping record though, because little things can add up. I obviously placed low priority on morning brushing but on the other hand she never flosses, and here we're discussing the minute details of flossing technique.
jemmyw•9h ago
I read an article a few years ago about what brushing actually does for your teeth and why it works. The premise was that brushing applies fluoride and removes the bacterial film that eventually turns into plaque - and that about 2 minutes of brushing a day would be sufficient if we were perfect at brushing. Doing it twice a day ensures that you get good coverage. It also went into the best brushing technique etc.

Since reading that I've not stressed about missing the odd brush here and there. I've also been more conscious how I brush. I stopped flossing because my gums seem quite sensitive to it and it doesn't have great evidence of effectiveness. I use a inter-denture pick/brush occasionally when needed. This all seems to have improved things for my teeth considerably, my dentist now saying they're really clean - and ironically stopped suggesting I floss more.

I wasn't joking in my previous post about the cycling accident that destroyed my front teeth, except that it happened 20 years ago. This year the crowns I had fitted failed so I've had those removed and implants installed. It's been very painful, I left replacing them probably 10 years longer than I should have. Yesterday I got a temporary bridge on the implants, which I can't use for biting. Still 2-3 months away from having the permanent new crowns fitted.

dsego•8h ago
I've recently realized how much technique matters, I was advised to use the modified bass technique (and also an inter-dental brush around the implant). My aggressive brushing used to cause my gums to recede, even with expensive soft toothbrushes, but I think it's improving since adopting the new technique. Sorry to hear about your painful experience. I do a lot of cycling and my greatest fear is falling and hurting my teeth. Actually, my implant is a result of me not taking out a molar that had a root canal a decade ago and was getting inflamed a lot. Should've extracted it much earlier, because the recurring inflammation ate away the bone. I was lucky they had enough bone to work with, needed to wait half a year for it to heal and grow after extraction (there is still a visible depression in the gumline). I do floss, but one minor annoyance is that it catches on these ridges where my filling are, I even managed to break a piece once, so I'm a bit more hesitant about scraping with the floss.
rustybolt•9h ago
This is plausible. My dentist says I should use toothpicks, but they are not useful for me as they don't really fit between my teeth. I do the most problematic of my tooth with an "extra small" pick now, and I can usually get those four gaps done before the pick breaks.
ses1984•10h ago
Well based on the amount of shit I dig out even if I floss after, and it’s effect on my breath, ima keep doing it.
rustybolt•10h ago
Yes, that's exactly my reasoning. Even if it doesn't help for anything, it just feels satisfying and more clean. Kind of like picking your nails.
dexwiz•10h ago
Some people do over floss and it can cause permanent gum damage. I assume that is a tiny fraction though.
jpalawaga•10h ago
there are studies that show that flossing with the wrong technique doesn't do much. and it's meh on cavity prevention. what it does do is prevent gingival inflammation, which can be good for gum health, especially if you're prone to getting food caught in there.
gdulli•10h ago
If you floss too hard or aggressively then that can be bad for your teeth/gums. If you floss only rarely causing your gums to bleed when you do and you don't wash or brush away the dried blood, that can also be bad. But I don't believe that any dentist in good faith would advise not to floss, if done properly.
aaronbrethorst•10h ago
I'm surprised that this isn't self-evident. Flossing dislodges stuff from between your teeth. Brushing beforehand means you don't have an opportunity to remove that stuff.
dsego•10h ago
Why don't you have the opportunity? Flossing removes the stuff.
dexwiz•10h ago
Not completely. It might end up on the floss but it might also end up on your teeth or gums.
dsego•10h ago
How does brushing remove it then? I'm guessing it's still in between your teeth.
stronglikedan•10h ago
And just rinsing removes it.
Traubenfuchs•10h ago
I have talked about this flossing topic surprisingly often and it's one of the reasons I believe the majority of people are idiots with zero critical thinking. Especially in regards to health. No one seems to read inlets or understand them. It's awful.
tonyspiff•10h ago
There's the argument that flossing afterwards would drag some fluoride/nHAP to the space between your teeth which wouldn't be reachable by the toothbrush.

So I floss during brushing. One pass with the toothbrush, floss, second pass with toothbrush, rinse.

dsego•10h ago
I've also seen some tiktoks with people coating the floss with toothpaste so it reaches in between the teeth.
stronglikedan•10h ago
My dentist says the opposite, since toothbrush bristles don't get between the teeth. According to her, brushing after flossing just pushes all the dislodged stuff back between the teeth.

In my opinion, it doesn't really matter which you do first, as long as you rinse well after each step. I brush first - get most of it with the brush and rinse, then get the rest of it with the floss and rinse.

HPsquared•10h ago
Surfactants in toothpaste should prevent anything sticking while brushing.
OutOfHere•9h ago
1. Rinse with water.

2. Brush without toothpaste.

3. Floss

4. Brush with toothpaste.

peacebeard•9h ago
General awareness of if what you’re doing is successfully getting stuff out of your teeth beats following a guiding principle and trusting it’s automatically working.
sauwan•10h ago
Well, the benefit here is the application of fluoride, which isn't something most people are actively thinking about maximizing.
jauntywundrkind•10h ago
My logic was that brushing deposits fluoride onto the teeth, and that I want that there.

Flossing feels not that different from following up toothbrushing by rinsing (bad): it's removing a bunch of the amazing good stuff the toothpaste is designed to deposit.

jayd16•10h ago
I thought the ideal order was brush, floss, mouthwash.
srik•10h ago
Using mouthwash every time is not ideal because most mouthwashes disrupt your oral microbiome which will result in undesired side-effects like teeth staining etc.
ravenstine•10h ago
I've heard this before, yet my mouth remains... unaffected.

What does an "oral microbiome" even mean? I understand what it means in the literal sense, but would a person's mouth be dysfunctional if it were hypothetically devoid of microbes? Is there an accepted healthy oral microbiome composition?

dsego•10h ago
You can get oral probiotics, like lactibiane buccodental. These healthy bacteria compete with harmful bacteria that causes cavities and gum disease.
jayd16•10h ago
You're saying we can make good toothpaste but we can't make good mouthwash?
dingaling•10h ago
No, mouthwash after brushing removes the fluoride that the toothpaste has just deposited. Similarly, avoid rinsing after brushing.

There's not really a 'good' time to use mouthwash. Maybe an hour or more after a meal, if you're in a rush - but no sooner than that, as the tooth enamel will still be softened by the food.

jayd16•10h ago
Even with flouride mouthwash? You're saying the paste/gel is physically more capable of depositing flouride or something?
eqvinox•10h ago
Did they teach it the other way around somewhere? Here (Germany) I've been told floss before brush for as long as I can remember...
bena•10h ago
When I get my teeth cleaned at the dentist, flossing is the last thing done. So I assume people internalize that
distances•10h ago
So a stupid question, but does teeth cleaning do something more than removing the stone (calculus)? My dentist removes that with a spike during a checkup and isn't doing any upsells so I've never in my life had a separate cleaning appointment.
RandallBrown•10h ago
My dentists have always done a floss, polish, and fluoride treatment (in addition to the tooth scraping) as part of my cleanings.
bena•10h ago
Yeah, scrape away any built up plaque, polish, floss, check for cavities, x-rays every other visit (once a year).
distances•10h ago
Cavities & x-rays is a check-up though, covered by my health insurance. Cleaning would be a separate session out of pocket
bena•9h ago
I don't know what to tell you. Every 6 months I go to the dentist. They do all those things. They bill my insurance. I pay whatever is left over.
distances•8h ago
Yes yes, I got it :) Was just curious about the different approaches.
RandallBrown•7h ago
Every checkup includes a cleaning so they're usually used interchangeably (at least everywhere I've lived in the US).

Dentists don't usually do any of the cleaning, that's the job of the dental hygienists.

jhack•10h ago
This is how I've always done it and I was blown away when I found out people do it backwards. It makes no logical sense.
dsego•10h ago
Why not? Brushing and swishing removes most of the particles, and then you floss to reach the tight spaces.
DuncanCoffee•10h ago
Because when you floss you create more particles
azemetre•10h ago
Doesn't rinsing your mouth out with water solve this?
dsego•10h ago
Nowadays the advice is not to rinse so you don't rinse away the fluroide from the toothpaste.
kcrwfrd_•10h ago
I can’t imagine not rinsing after brushing, with your mouth full of toothpaste
sublinear•10h ago
I also rinse after flossing before brushing. Then I rinse again after brushing.

I also rinse throughout the day whenever I can. It's not a routine for me as much as a habit along with generally always having plenty of water to keep things moving and clean.

CoastalCoder•10h ago
Is there empirical evidence that this order is more effective?
gcanyon•10h ago
The article cites a study saying that it is.
ninju•10h ago
https://pubmed.ncbi.nlm.nih.gov/29741239/

(a study linked in the article)

derbOac•10h ago
The essay links to this study, so yes:

https://pubmed.ncbi.nlm.nih.gov/29741239/

I was a bit confused about why it would matter, but then realized I brush, then floss, then use a fluoride rinse, which isn't really addressed by the study. If you didn't use a rinse or a fluoride floss, presumably the toothpaste from brushing would be more likely to get into the areas between your teeth after flossing.

If you use a fluoride rinse or fluoride floss I'm not sure it would matter much, or brushing first might even be better, because it would remove material to make flossing more effective. Maybe?

dsego•10h ago
I mean, it's advice from someone on the internet, are there any studies to back it up?

Edit: I missed the study linked at the bottom.

I floss after brushing, just because brushing removes a lot of particles. If I floss before, there is just so much more flossing I need to do to get everything out. I learned another thing recently, to use a proper brushing technique, I think it's the modified Bass technique. I also make sure to let the bristles go underneath the gum line.

fishtoaster•10h ago
Well, TFA linked to https://pubmed.ncbi.nlm.nih.gov/29741239/
brap•10h ago
Might sound like an ad but I don’t care:

I cannot recommend enough Jordan Expand floss. There are probably other brands that have these but that’s just the one I know.

The amount of shit this floss scrapes out is like an order of magnitude more than regular floss. Going back to plain floss feels like you’re not even flossing, it just glides over without really doing anything.

scoot•10h ago
While we're on the subject, if you brush after meals, you're doing it wrong.

Brush first thing in the morning (before your first meal/drink, other than water), and last thing at night (well after your last meal).

Plaque acid is at its lowest, so this approach results in the least damage to enamel from brushing. (Amongst other reasons.)

For a similar reason, only have a thorough brush in the morning, and a mild brush in the evening.

NoboruWataya•10h ago
It so happens that this is what I was doing, which is good. However, for years I was brushing after eating my breakfast because I assumed it was the better way as then you aren't going about your day with your breakfast on your teeth. But when I looked into it I found that for a variety of reasons it is apparently better to brush before breakfast. So it was an important lesson in not assuming the "obvious" (to you) way is the best.
PcChip•10h ago
I'm curious what these reasons are

(My second thought after typing that was "I suppose I could just ask an LLM though")

chucky_z•10h ago
There are 'best to brush' timelines around eating/drinking. Usually you want to either:

- Brush no less than 15m before eating

- Do not brush until 45m+ after eating

I don't fully understand the science, as I'm not a dentist, but it's something related to the way that things stick to/are absorbed by enamel and dentin.

I believe water is the exception here, you can drink water and then immediately brush. You should not brush and then immediately drink water though. You want the toothpaste to stick around and form a barrier.

dsego•10h ago
Supposedly, after eating the pH in the mouth drops and becomes more acidic, which softens the enamel, so brushing will do more harm than good. That's my understanding.
deepvibrations•9h ago
So long as you leave a gap of 45 minutes, you're still better off cleaning After breakfast as far as I understand.
SilverElfin•10h ago
How do people here feel about water flossers?
Herring•10h ago
I got one recently. Felt like my teeth have never really been clean before.
OptionOfT•10h ago
From my convo with the dentist (N=1): flossing is better. But anything is better than not doing anything.
pyk•10h ago
Incredible for post-popcorn, and for $10 nowadays a no brainer. I still find floss does a better job at scraping the sides of the tooth vs water flossers for dislodging.
plorkyeran•9h ago
The most important thing is to find something that you'll use regularly. If you find water flossing easier to do daily than manual flossing, that's more important than which is better at cleaning your teeth.
crimsoneer•10h ago
Worth pointing out the evidence for flossing at all is pretty darn poor.
PlunderBunny•7h ago
Yeah, but have you ever smelled a little bit of meat that has been stuck between your teeth for a while?
gcanyon•10h ago
For anyone who's curious, Reach TotalCare Floss is the best:

   * Very shred-resistant
   * Grippy, even when wet, so you don't have to turn your fingertips purple
   * Thin enough to fit most teeth, but supposed to have some sort of textured surface to work better
stronglikedan•10h ago
I find that regular old Reach waxed works just as well, and has two benefits over Totalcare: it's more comfortable and it's cheaper — dirt cheap for floss, really.
snozolli•10h ago
On the subject of dental health: Bill Burr, the comedian, worked as a dental assistant when he was younger. He gave a piece of advice on his podcast that I wish I had heard when I was young: if a dentist tells you that you have a cavity, get a second opinion.

Once that outer layer of enamel is breached, it will never be as resilient again.