1. How many times a day should you brush your teeth?
- A
1
- B
2
According to Dr. Doan Hong, Vietnam Institute of Applied Medicine, most experts and dentists recommend that people brush their teeth twice a day with toothpaste (containing fluoride), for two minutes each time. You should also not brush your teeth more than three times a day because too much can wear down the enamel. The best time to brush your teeth is at the beginning and end of the day, but many people skip or often forget at night.
Saliva actually helps prevent bacteria from attacking tooth enamel, but saliva production is significantly reduced at night, making brushing before bed an important part of your oral hygiene routine.
Over time, skipping brushing at night can lead to significant damage, including a higher risk of plaque buildup on your teeth. So brushing once a day is not enough to maintain good oral hygiene. Studies show that it only takes about 4-12 hours for plaque to start forming on your teeth. The longer bacteria stay on your teeth, the more dental problems they can cause. Some potential side effects of brushing only once a day include tooth decay, gum disease, and chronic bad breath. - C
3
2. How often should you replace your toothbrush?
- A
2 months
- B
3 months
If you tend to forget to brush your teeth before bed, brush your teeth right after dinner. Use a soft-bristled toothbrush; replace it every three months.
According to a study by Bioteca (Korea), after three months, toothbrushes become a breeding ground for 4 million bacteria, including E-coli in human feces. You can floss before going to bed to remove food and debris between teeth, helping to freshen your breath. - C
4 months
- D
5 months
Source: https://vtcnews.vn/nen-danh-rang-bao-nhieu-lan-moi-ngay-ar904189.html
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