>　　It is generally considered a danger to the two dental disease, first caries, and the second is periodontitis. Dental caries, commonly known as tooth decay, dental common multiple. Dental caries in many causes, one of the important reasons are: poor dental calcification, not enough hard texture and can easily be damaged. Tea can protect teeth, has been in the application of ancient China. Song Su in the "tea" Zhongyun: "tea mouthwash, both to trouble greasy, but also Kennedy teeth, absorbing and marine." Modern scientific analysis, Tieguanyin contains a wealth of fluoride, and general Few of fluoride in food. Tieguanyin Fluoride in about 40% to 80% dissolved in water, vulnerable and in the teeth of the combination of calcium in teeth formed on the surface of a layer of calcium fluoride and played anti-acid anti-caries effect.

　　Japan in two adjacent villa