How to prevent yellowing of teeth?

How to prevent yellowing of teeth? 1. Try to use warm water to brush your teeth with warm water, soak the brush head with toothpaste for 1-3 minutes, because this can make the bristles soft and elastic, reduce the friction loss of the bristles on the teeth and the damage to the gums. Irritant damage. 2. Change a toothpaste every month. It is best not to use a toothpaste for a long time, because the bacterial content of the same brand and type of toothpaste is fixed. If a toothpaste is used for a long time, the bacteria in the mouth will not be killed. If you die, you will also develop resistance. In addition, the chance of being exposed to bacteria is higher if you use it for a long time, so it is best to buy toothpaste for a month. 3. Try to wash your teeth once every six months. Tobacco and alcohol will corrode the teeth and deposit a lot of plaque, melanin and calculus on the surface of the teeth. Dental experts have found that men are more prone to periodontal disease because of tobacco, alcohol and improper diet. It is recommended to clean their teeth every six months to detect problems early. 4. Try to eat some Vc-type tooth protection foods. If you lack vitamin C, periodontal disease may occur. Therefore, you must eat vitamin C-rich tooth protection foods every day, such as vegetables, oranges, and lemons that contain a variety of trace elements. And rich in vitamin C, it is a mouthguard food that cannot be ignored, and vitamin C tablets can be supplemented if necessary.