China is the first country in the world to cultivate and drink tea. Since ancient times, we have been drinking tea and gargling with tea water as a method to prevent caries. Relevant research proves that the main component of tea that can prevent caries is that it contains substances such as fluorine and catechol. Fluorine ion can change hydroxyapatite in tooth enamel into fluorapatite, which improves the structure of tooth enamel and enhances its anti-acid effect; catechol and other substances can inhibit the proliferation of Streptococcus pyogenes (i.e. cariogenic bacteria) in the mouth. Tea contains alkaline substances, its decontamination and fishy, greasy effect is much stronger than the general water. Commonly used tea gargle after daily meals, can decontaminate, sterilization, anti-inflammatory, to achieve the role of dental health. Some people in China also after eating garlic, chewing tea to remove the odor. In short , tea plays a very important role in oral health care, and simple and easy, let’s all implement this health care measures.