1, tea contains tea polyphenols, which are easy to produce tea rust. If it enters the human body, it can also cause inflammation, ulcer, necrosis and other diseases in organs such as kidney, liver and stomach. Therefore, you can't drink tea overnight, and the tea set for making tea should be scrubbed frequently.

2. Summer is a season with high temperature all the year round, so tea is easy to go rancid and sour. If it takes more than 24 hours, it is best not to drink it, otherwise it will cause diarrhea.

3. Overnight tea for making tea has been left for too long, and most of its vitamins have been lost. Moreover, protein and sugar in the tea have become nutrients for the reproduction of bacteria and molds, so it is not suitable for drinking.

Extended data:

The magical use of overnight tea;

1, overnight tea is rich in acid and fluoride, which can prevent capillary bleeding. For stomatitis, eczema and gingival bleeding, it can be prevented and treated by gargling with overnight tea. Wash your hair or wipe your body with warm overnight tea. The fluorine in the tea can quickly relieve itching and prevent eczema.

2, the ancient law believes that washing your hair with overnight tea can remove dandruff and promote hair growth. Washing your eyebrows with overnight tea every day for a period of time can make your eyebrows dark and shiny. Fluorine in tea will enhance the resistance to acidic substances and reduce the occurrence of tooth decay; Fluorine can also eliminate dental plaque.

3, after eating seafood, you can wash your hands, brush the pot and go to the cockroach with overnight tea; Scrubbing oil pans, basins, etc. with overnight tea can get rid of greasy and oily stains.

References:

People's Network-overnight tea is actually a good thing.

People's Daily Online-Caution: Why can't I drink overnight tea? Hazard inventory of overnight tea