Foods that are high in sugars promote plaque buildup because bacteria is attracted to sugars.   If you do eat sweets, try to eat ones that don't stay in your mouth for too long. Candies such as lollipops, hard candy, and caramels tend to stay in your mouth for long periods as you suck on them. Snacks like cookies, cakes, and pastries also contain lots of sugar and can cause tooth decay. Foods such as bread, chips, pasta and crackers contain starches and refined carbohydrates that are sugars. If you do eat them, try to eat these foods only at mealtimes rather than as a snack between meals. If you do eat sweets and refined carbs, try to brush your teeth with a fluoride toothpaste afterwards. Carbonated soft drinks are very high in sugar. Fruit juices often contain hidden added sugar, especially if they are called "fruit juice drinks" or "fruit juice cocktails." Avoid these.  Carbonated soft drinks are also very acidic. Acids in drinks and food can break down enamel and increase the risk of tooth decay. While fruit juices are healthy in moderation, they contain a lot more concentrated sugar than whole fruit without the added benefit of fiber. Drink only 100% fruit juice with no added sugar. Research suggests that 100% fruit juice is unlikely to cause tooth decay. If you drink these items, make sure to do so with a straw to minimize contact with your teeth. Acids from foods can erode enamel just as much as acids from soft drinks.  Acidic foods include citrus such as lemons and limes. Tomatoes, pickles, honey and wine are also acidic foods that can cause damage to your enamel. While it's ok to eat these types of foods, try to keep them in your mouth for as short a time as possible. Tap water is fortified with fluoride in most countries.  Anything you make with tap water that is fluoridated will help to strengthen your enamel.  Water can help to wash away food particles. Green and black teas contain properties that prevent plaque buildup. These teas can also help to reduce inflammation and prevent gum disease. Be...

TL;DR in Vietnamese:
Tránh các loại kẹo đường, đồ ngọt, tinh bột và carbohydrate tinh chế. Hạn chế uống nước hoa quả và nước ngọt có ga. Hạn chế sử dụng thực phẩm có chứa axít. Uống nước từ vòi và trà xanh/đen. Ăn thật nhiều hoa quả và rau củ giàu chất xơ. Ăn các sản phẩm từ sữa như sữa, pho mát và sữa chua. Nhai kẹo cao su không đường. Sử dụng các sản phẩm dành cho người bị khô miệng. Nói chuyện với bác sĩ nếu bạn thường xuyên bị ợ nóng, trào ngược axít, hoặc rối loạn ăn uống.