Promulgated by the World Health Organization criteria for oral health: dental cleaning, no cavities, no pain, gum color normal. Authorities have in the United States over the age of 20 office workers conducted a tooth whitening survey found that 81% of people want to have white teeth, 39% of people think that their teeth is not white, and are willing to take measures to teeth whitening. Tooth colored, yellow for many reasons, generally can be divided into two aspects, namely, endogenous and exogenous.
Stain is due to the existence of a variety of tooth surface bacteria, which secrete a number of sticky substance, the diet tea dirt, smoke stains, and some minerals in drinking water adsorbed on these sticky substances on the teeth gradually yellow or black.
Endogenous color is formed in the process of tooth development, such as tetracycline deposition in dentin, could make the teeth yellow, brown or dark gray, as tetracycline; if too much fluoride in drinking water may also lead to dental fluorosis, teeth appear before the dental instruments white chalk color, brown patches, if the tooth nerve with necrosis and bacterial decomposition products also make the teeth black. For Stain teeth, coffee, tea, tobacco, red wine is the culprit.
According to statistics, China has 15% to 25% of smokers, many of whom are female smokers, which means that China has a 2 to 3 million people blackened teeth are yellow. The coffee, tea, red wine and the impact of the teeth can not be ignored. Teeth whitening Fixed dentures and denture which is better essence is a clear stain on the tooth enamel and enamel and pigment process. According to the color depth of the teeth, causes, should adopt a different approach to whitening.
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