This is mainly due to an abnormal diet, rich in carbohydrates and poor in raw vegetables, too low in vitamins and micronutrients, as well as hygienic neglect. Instead of serving milkshake sweetened tea type fix, you can brew ordinary herbs in bags and if necessary dilute with boiled water. Instead of sweets – give carrots, a slice of cabbage or kohlrape. Pay attention to children, preferably after each meal, washed their teeth! 🙂