Dental caries is a chronic progressive destructive disease, which cannot heal by itself like other damages in the body, and can only be restored by artificial materials after removing the decayed tooth tissue. According to the development rule of dental caries, the caries becomes deeper from superficial, and the cavity becomes bigger from small. In the early stage of caries, the affected teeth usually have no symptoms and are usually discovered only when the doctor examines them. The treatment of superficial caries is simple, the doctor only needs to remove the decayed material in the cavity and fill it up with suitable material to stop the development of the cavity. The treatment of superficial caries is usually completed in one time, saving time, less pain and less money, which is the best time to treat. However, many patients seek doctors only when they can’t eat or sleep normally because of toothache, so they miss the time of early treatment, and then the treatment process will be very complicated and need to go to hospital for several times to finish, and the treatment cost and time will be greatly increased. In order to reduce the pain caused by tooth decay and reduce the treatment cost, it is recommended to treat the tooth decay in time once it is found. At the same time, it is necessary to develop the habit of regular oral examination, children can ask the doctor for examination twice a year during summer and winter vacations; adults can ask the doctor for examination and scaling once a year. Older people should be examined once every six months.