Teeth eat bad is the occurrence of dental caries, in general, oranges and other foods will not directly lead to dental caries, but because oranges contain high sugar content, more acidic substances, after eating if you do not pay attention to oral hygiene, easy to cause demineralization of tooth enamel, resulting in the occurrence of dental caries. Dental caries is a kind of oral cavity caused by a variety of factors compound effect of dental hard tissue progressive lesions, manifested as inorganic demineralization and decomposition of organic matter, with the development of the disease from the color change to the formation of substantial lesions of the evolution of the process. Orange sugar content and acidic substances are high, after consumption of these substances can be tightly adhered to the tooth surface, if you do not pay attention to oral hygiene, in the appropriate temperature, there is enough time for plaque deep acid production, invasion of the teeth, so that the demineralization and then destroy the organic matter to produce caries. Therefore, we should pay attention to oral hygiene in daily life, eat less sugary foods such as candy, oranges, etc., develop good eating habits, pay attention to oral hygiene, found that the teeth have caries phenomenon, as soon as possible to seek medical treatment, to prevent further development of dental caries.