Usually I prefer drinking tea or coffee, so the dark things on my teeth are caused by these usual habits. Because this kind of food is dark in color, it is easy to cause pigment deposition, and it is difficult to thoroughly clean teeth when brushing teeth, so melanin will be formed.

Coffee and tea can make teeth produce melanin, so people should drink less of these drinks and avoid sugary foods, and rinse their mouths after eating.

Extended data:

Tea contains a lot of oxalic acid, which easily reacts with calcium excreted in urine to generate calcium oxalate, thus causing urinary calculi. At the same time, tea trees will be sprayed with pesticides in the growth process, and pesticides are easy to remain on the surface of tea leaves, and untreated tea leaves are easy to carry residual pesticides. Drinking tea on an empty stomach can also lead to dizziness, palpitation and trance.

Coffee contains a diterpenoid compound, which increases the risk of cardiovascular disease. At the same time, acrylamide will be produced during coffee baking, and large doses of acrylamide have been proved to be carcinogenic in animal experiments.

Caffeine can lead to the loss of calcium and increase the risk of osteoporosis; Caffeine easily excites people's nerves, and people with neurasthenia can cause insomnia and headache after drinking too much tea or coffee.

Drinking coffee and drinking tea have their own advantages and disadvantages to human health, so we can't generalize. It is generally believed that drinking tea or coffee in moderation is good for healthy people. But if you drink too much or have no restraint, it will definitely bring harm to your body.

People's Network-Why is there something black between your teeth? How to avoid this situation?

People's Daily Online-Drinking coffee and tea has advantages and disadvantages, so drink it in moderation.