Disadvantages of drinking tea: drinking old tea and coarse tea may cause fluorosis, because this kind of tea contains more fluorine, and drinking this kind of tea often can easily cause dental fluorosis or skeletal fluorosis. People who have poor sleep and are sensitive and excitable should try to drink less tea or not drink tea at night.

Extended data:

There are many kinds of tea, which can be roughly divided into non-fermented tea, semi-fermented tea and fermented tea. All kinds of teas are different for people. Drinking tea regardless of your constitution may bring some discomfort. For example, green tea is rich in tea polyphenols and caffeine, which is irritating to the stomach. People with bad stomach should drink less green tea, especially not on an empty stomach, otherwise there may be a phenomenon of "drunk tea".

Such people can choose black tea that warms their stomachs, or add milk and brown sugar to tea soup. Scented tea is suitable for women to drink, especially around menstruation or menopause. Drinking scented tea can reduce irritability.

Oolong tea such as Tieguanyin and Wuyi Rock Tea has a good effect of reducing blood fat and helping digestion. It can also be drunk when staying up late, which can refresh and relieve fatigue. Pu 'er tea is moist and greasy after fermentation, which is suitable for people who love meat.

Black tea or oolong tea is often aged tea, especially Pu 'er tea cake. The older you get, the stronger the fragrance. This kind of tea usually needs to be washed quickly with boiling water (10~20 seconds), and then the tea is turned upside down, which can not only wash the tea leaves, remove possible microorganisms, but also heat the tea leaves, which is beneficial to the volatilization of tea fragrance. Some people are reluctant to pour the first bubble, but the taste is not good, not worth the loss.

Some people who play with teapot don't want to wash the tea dirt off the teapot, thinking that it can raise the teapot. In fact, tea scale is not only bad for health, but also affects the taste of tea. Tea scale is a kind of metal chelate formed by oxidation of tea polyphenols in tea and metal elements in tea rust.

Although there is no relevant research to prove that tea stains are harmful to health, it is suggested to wash tea stains in time from the perspective of health, and they can be easily washed off with toothpaste or salt water.

Not every kind of tea should be brewed with boiling water. Generally speaking, it is best to use freshly boiled water for black tea, black tea and oolong tea, and tea leaves will be more fragrant. Green tea is very tender. If soaked in boiling water, the polyphenols in it will be destroyed, and the tea soup will not only turn yellow, but also the aromatic substances will be lost.

Green tea should be brewed in water at 80℃~85℃ for 2~3 minutes, and it is best to drink it now. It is not recommended to drink tea while it is hot, which will easily burn the gastric mucosa and mouth. Leave the tea for a while before drinking.

References:

People's Network-Six misunderstandings of drinking tea regardless of physical fitness are harmful to health.