Korea's '3-3-3' toothbrushing rule: Healthy habit or myth?
Photo: Brushing teeth after every meal – is it beneficial (Freepik)
In South Korea, people often brush their teeth three times a day, after each meal. This practice is called the “3-3-3” rule.
New York Times explains whether it’s suitable for everyone.
Why oral hygiene matters
Proper dental care isn’t just about a nice smile. Studies link good oral hygiene to a lower risk of serious health issues, including Alzheimer’s disease and rheumatoid arthritis.
The “3-3-3” rule
Originating in the 1980s, the rule recommends:
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Brush three times a day
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Start brushing 3 minutes after eating
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Brush for 3 minutes
The practice became so popular that public brushing stations appeared in subways, cafes, and shopping centers, with some schools even providing dedicated oral hygiene stations.
Does extra brushing help?
Some research supports the benefits. A 2017 study found that people who brushed after lunch had a lower risk of gum disease. However, not all dentists consider it essential.
Why dentists advise waiting after meals
Dentist Daniel Naisan explains that brushing immediately after eating, especially acidic foods like citrus, soda, or wine, can damage temporarily softened enamel. Experts recommend waiting 30–60 minutes before brushing.
How long to brush
Two minutes of proper brushing is usually enough. Brushing for three minutes won’t harm, but it doesn’t give significantly better results. Aggressive brushing, particularly with hard bristles, can wear down enamel, making teeth thinner, darker, and more sensitive.
This material is for informational purposes only and should not be used for medical diagnosis or self-treatment. Our goal is to provide readers with accurate information about symptoms, causes, and methods of detecting diseases. RBС-Ukraine is not responsible for any diagnoses that readers may make based on materials from the resource. We do not recommend self-treatment and advise consulting a doctor in case of any health concerns.
