Tartar normally present in the surface of the tooth and the tooth neck opening of the salivary glands, oral mucosa, and not the movement of the tooth surface, etc., which is composed of 75% of calcium phosphate, 15-25% water, organics, manganese phosphate, mineral and traces of calcium, potassium, sodium, iron constitution, and showed a yellow, brown, or black. Generally newborn tartar need twelve to fifteen hours, calculus formation are just soft, calcification after a period of time will gradually harden. Therefore, in the beginning of the formation of dental calculus, method or use oral hygiene brushing method, very easy to remove tartar, that is difficult to remove until after calcification. Tartar on oral terms is a different object, it will continue to stimulate the periodontal tissue, oppression gums, affecting blood circulation, causing bacteria periodontal tissue infection, causing inflammation of the gums shrink, forming a periodontal pocket, causing further ligament damage, and finally to the formation of periodontal disease. So six months regularly scaling to remove tartar and gum disease prevention in the future have a great effect, and must not be overlooked.

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• Overview of dental dentistry