The filling process 1, in the process of removing decay and preparing cavity shape, the application of dental drills will stimulate the sensitive dentin and pulp to produce a painful feeling, which is difficult for many people to endure, while the sound emitted by the high-speed dental drill rotating is also prone to cause fear of children. This is why people are afraid of going to the dentist. Why sometimes fillings can't be done in one visit? Filling process 2. When people ask the doctor to fill their teeth, they want to do it in one visit. Shallow caries, medium caries and some deep caries patients, after exhausting the decayed tissue, when there are no subjective symptoms, it is possible to implement the immediate filling method. But when the deep caries patients, there are subjective symptoms in the past, when to exhaust the carious tissue, regardless of whether there is spontaneous pain should be implemented to postpone the filling method, in this case the filling can not be completed at once. Filling process 3, immediate filling method is in the preparation of the hole immediately after filling, but before filling must be used to stimulate the small drugs (such as camphor phenol, phenol, eugenol, etc.) to disinfect the bottom of the hole and hole wall; if the bottom of the hole is not caries dentin, available zinc oxide and clove oil adhesive powder covered with a layer of zinc phosphate adhesive powder cushion a layer of the bottom of the last permanent material (such as amalgam, etc.) filling. Dental filling process 4, delayed filling method is to first seal the bottom of the cavity with drugs, temporary sealing of drugs and then observe 7 to 10 days, such as no symptoms, pulp vitality test is normal, and then filling. This method is suitable for those who have a small amount of necrotic tissue at the bottom of the cavity. If there are slight symptoms after sealing, seal and observe for 3 months, if the symptoms disappear and the pulp vitality test is normal, fill the cavity after capping the pulp. If there are severe symptoms and spontaneous pain after sealing; or if there are no symptoms after sealing and the symptoms worsen in another 3 months of observation, the pulp should be opened for endodontic treatment. If caries develops into pulp disease and periapical disease, the treatment will be more complicated. Therefore, fillings sometimes can not be completed at one time.