Whether overnight tea can be drunk has not been scientifically demonstrated so far. In life, the secondary amines contained in instant tea can be converted into carcinogenic substances-nitrosamines, and the ingredients contained in tea have also changed, so it is not recommended for everyone to drink.

While drinking tea, we should also learn to understand the knowledge of tea. Tea ceremony is a long-standing cultural tradition in China. Even if you drink green tea, it will turn yellow or red after a long time. Sometimes people think it's a pity to throw it away. In fact, the brewed tea still has a great effect.

The following are some wonderful uses of overnight tea in life:

First, go to bad breath: the smell in tea is fragrant. Before and after brushing your teeth in the morning or after meals, gargle a few mouthfuls of overnight tea, which can make your breath fresh, and often gargle with tea can eliminate bad breath.

Second, anti-inflammatory: Tea polyphenols in overnight tea have antibacterial and anti-inflammatory effects. If red silk appears in your eyes, you can wash it with overnight tea several times a day.

Third, stop itching: wash your hair or wipe your body with warm overnight tea. Fluorine in tea can quickly relieve itching and prevent eczema.

Especially in the winter in the north, because of the heating, it will dry when you wake up. People prefer to drink a glass of water to moisten their throats, but it is best to choose boiled water. Although there is no proof that overnight tea can be drunk, the color of tea will not change until the next day. For health reasons, it is better to pour it out and brew it.