Milk and dairy
Milk and dairy are superstars for nutritionists, and they do give you a lot of vitamins and minerals. Milk is an excellent source of calcium, but the natural sugar milk has can be a hidden cause of cavities, especially if you follow that tradition of drinking a glass of milk before going to bed. Similarly, yogurt is not the best choice because, even if a substantial part of lactose is fermented by bacteria, they turn yogurt into an acidic food that contributes to eroding your tooth enamel, adding up to tooth decay. So, the best option to consume these nutrition superstars is early in the day, and brushing your teeth a few minutes after (not immediately).