Side effects of black tea

Excessive drinking of black tea can cause sleep disorder, stomach discomfort, teeth blackening and other side effects.

1, sleep disorder

black tea is rich in theophylline, if excessive drinking, will cause nerve excitation, and then affect daily sleep, can lead to changes in sleep habits.

2, stomach discomfort

black tea contains tannic acid, fluoride and other substances, if excessive drinking will stimulate local gastric mucosa, can appear abdominal pain, abdominal distension and other discomfort symptoms.

3, teeth blackening

If excessive drinking of black tea leads to the accumulation of pigment on the tooth surface to form tea stains, will make the teeth black, affecting the aesthetic degree.