Dental caries, usually called “worm teeth”, is one of the common diseases in the oral cavity, and many people do not pay enough attention to it. If you have caries, you should go to the hospital for repairing in time, because after treatment of caries, you can stop the development of caries, restore the function and beauty of teeth as early as possible, keep the integrity of the dental row and avoid the premature loss of teeth. Caries is caused by decalcification, softening and destruction of hard tissues of teeth, finally forming cavities, if not treated in time, the lesion will become more and more serious, from shallow to deep, from small to large, and can be sensitive to cold, hot, sour, sweet and other food stimulation; when the lesion reaches the pulp, it will cause pulpitis, at this time, toothache will be very serious, as the saying goes, “toothache is not a disease, but pain will kill you. “If the lesion is not treated in time, it will cause periapical inflammation, periapical abscess, and even tooth loosening and loss. Missing teeth, besides affecting the beauty, will definitely affect the chewing function, aggravate the gastrointestinal burden, and then affect the health. There are a large amount of bacteria and pus in the cavity of caries, which is a potential foci of disease. When the resistance of the body decreases, it can cause subacute bacterial endocarditis, nephritis, sepsis or bacteremia, etc. And filling can terminate the occurrence and development of these diseases, so the carious disease should be treated (filling) in hospital as early as possible. In the case of pulpitis, patients will have severe pain due to factors such as congestion, edema and inflammatory exudation in the pulp, and the pain will be aggravated at night due to the change of position, which affects the normal work and life. If early treatment is good, the possibility of its occurrence can be avoided. Also, caries has acute caries and violent caries, and it has fast progress of lesion. In children or young people, it is easy to be infected and pulp lesion occurs. Children with caries hinder food chewing and nutrition digestion and absorption; the decrease of chewing power, its role of stimulating jaw bone growth and development also decreases, causing the deformity of facial bones and teeth. For these sick patients, it is more important to fill the teeth as early as possible for treatment, which can stop the rapid development of caries. There are two benefits of filling: 1. prevent the development of lesion and relieve the pain; 2. restore the chewing function. With the continuous progress of technology, the current oral treatment equipment in China has kept up with the trend of the times. Fillings are very convenient, the earlier the repair, the easier it is, not only less painful, and save money and effort.