this post was submitted on 26 Nov 2023
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What's really strange to me, is that for all the expertise around dentistry, AFAIK there has never been an actual evidence-based study for how long and how often you should brush and floss.
Its literally the most important piece of dental advice they could study, and no research has been done. How much plaque builds up on average when only brushing once per week, once per month? It makes me question the whole discipline and wonder if they don't just say "brush 10 times a day" in order to sell more dental products.
Maybe they'd discover that actually you only need to brush twice a week, and floss twice a week. Maybe it ends up being flossing every day, and brushing once a month... who knows.
The National Institute of Health has a ton of public-paid studies. Did you even bother to search it before making your astounding claim? https://www.nih.gov
Just one search for
nih brush timeshows several studies. Let me just link the top two...https://pubmed.ncbi.nlm.nih.gov/19723429/ -> "This study was undertaken to measure plaque removal during untutored brushing over timed periods between 30 and 180 seconds with"
https://pubmed.ncbi.nlm.nih.gov/16355646/ -> "This review shows that there is consensus in the literature that (meticulous) tooth brushing once per day is sufficient to maintain oral health and to prevent caries and periodontal diseases. Tooth brushing is also regarded as an important vehicle for application of anti-caries agents, such as fluorides. However, most patients are not able to achieve sufficient plaque removal by performing oral hygiene measures at home. Therefore, tooth brushing twice daily is recommended by most of the dentists in order to improve plaque control."
OP poses one question with two parts. The first study answers the time (2-3 minutes) part. The second link answers the other part (twice daily).
Is there any way to actually see those articles? All that's given is an abstract, and the articles don't appear to be linked.
https://kagi.com/search?q=pubmed+download+full+text
-> https://www.nlm.nih.gov/oet/ed/pubmed/quicktours/fulltext/index.html
It looks like the two articles I linked don't have free sources available. You might also search for the co-authors of the studies -- for example the first author in the first study has other citations https://pubmed.ncbi.nlm.nih.gov/?term=Creeth+JE&filter=simsearch2.ffrft with full text available. You could download those, obtain the author's contact information, and send a request for a copy of the one you want. Just be nice about it :) If that doesn't work then maybe you have a friend with a "subscription" to download such things... from school or work or... something.