a diet for good oral health have few basic rules:
1. To reduce the intake of carbohydrates because they are a nourishment for caries-causing bacteria
2. Every time we eat carbs our pH in mouth lowers. After that out saliva evens the pH (it works as a buffer). Lower pH (averagely between 5,4-6,4) is a better enviroment for caries-causing bacteria. So not only the amount of carbs but also the frequency matters. We should not eat carbohydrates frequently during the day (2-3 times/day is a natural thing but 6-7 times/day is not healthy) and it is even more important that daily intake.
3. Acidic drinks (ex. coca-cola, some juices, wine)cause an erosion which is a destruction of enamel but it's origin does not come from bacteria. Don't overuse this sort of drinks.
4. Don't forget to floss :)
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