A day of moderate drinking tea is good for health, but often drink tea but may impair renal function, its potential harm nots allow to ignore. Now there is a disease called " tea type fluorosis ", refers to the excessive intake of fluoride content high tea or tea products caused by chronic fluorosis. Fluoride poisoning can lead to weakness, anorexia, dizziness, headaches, memory loss and other symptoms. Tea containing high fluorine, often drink tea can damage the kidneys. The reason is, the kidney is the main organ of fluoride excretion, when the body of excess fluoride intake than renal excretion ability, lead fluoride accumulation in the body, the kidneys fluoride content increased significantly. Experimental results show that, retention kidney excess fluoride can cause animal renal cortical and medullary renal tubular damage. Many people think that drinking tea can be anti. In fact, tea instead of alcohol, but also cause kidney damage. Reason is the tea of theophylline can quickly through the kidney, produced a diuretic effect, it will induce yet oxidation of acetaldehyde prematurely into kidney. Acetaldehyde on kidney strong toxicity, can cause renal glomerular and tubular cell damage, harm to kidney function. So, drink tea hangover is paltrily. So, every time the tea should not be more than 5 grams per day, no more than two tea. In addition, brick tea, Pu'er tea fluoride is more, should not drink.