龋齿是牙齿硬组织逐渐毁坏、崩解的慢性口腔疾病。它主要是由于牙齿在经常受到口腔内酸性物质的侵蚀后,使牙釉质逐渐变色、软化,进而破坏牙本质而形成的龋洞。若龋洞得不到及时处理,则可导致牙组织崩解而仅残留牙根。龋齿是极为常见的口腔多发病之一。幼儿及学龄期儿童尤为多见,且病变 Dental caries are the chronic oral diseases of gradual destruction and disintegration of tooth hard tissues. It is mainly due to the teeth in the oral cavity often eroded by acidic substances, the enamel gradually discoloration, softening, thereby undermining the formation of dentin cavities. If the cavities can not be treated in time, they can cause the tooth tissue to disintegrate leaving only the roots. Dental caries is one of the most common oral diseases. Children and school-age children are particularly common, and lesions