Hacker Newsnew | past | comments | ask | show | jobs | submitlogin

Preventing cavities is far more effective with topical application of fluoride on the teeth, rather than ingestion.

I personally don’t buy the passive health benefit. Even if it’s true, there’s no proof that fluoridated water is superior to topical application.

Not to mention that if we’re going to just roll over and accept stuff in the water for public health reasons, what really should be added are more vitamins, not fluoride. In particular vitamin D



For children developing their “adult teeth” fluoride ingestion strengthens those teeth before they pop out. Topical has no effect obviously since they haven’t surfaced yet.


And for that there is fluoride mouthwash, which again isn’t ingested and would be more effective.

> Regular use of fluoride mouthrinse under supervision results in a large reduction in tooth decay in children's permanent teeth.

https://pmc.ncbi.nlm.nih.gov/articles/PMC6457869/#:~:text=Be...


That doesn’t work because it’s topical. You give kids vitamins to get fluoride into their system to strengthen their developing adult teeth.


Great - so why do we need it in the water then? Not to mention that caries in kids teeth isn't really that relevant anyway since they fall out. Fact is, adult teeth is what matters and topical fluoridation is the most effective way, in addition to brushing and flossing to maintain dental health.

Would love to see evidence to the contrary (ingestion is superior to topical application w.r.t. fluoride).


Where did I say it had to be put in water? I literally said kids should consume vitamins with fluoride. You’re the one making up things about a topic you don’t understand.

You really want to strengthen teeth as they’re developing. It’s critical. Your “fact is” is wrong although you want to do that too. Continue to fortify after they grow in.

May I ask what motivates you to post things here where you clearly have 0 knowledge about a subject and you just write things that sound logically right in your head but are wrong?


My original post says this:

> Preventing cavities is far more effective with topical application of fluoride on the teeth, rather than ingestion.

Since you don't seem to disagree, there's nothing to discuss then. Cheers! Also, it is a fact that fluoride is most effective towards preventing cavities topically. You can Google Scholar this and see for yourself. There's a reason dentists prescribe high-fluoride toothpaste or gel, instead of just saying drink more fluoridated water.




Consider applying for YC's Fall 2025 batch! Applications are open till Aug 4

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: