It is the main method to terminate tooth decay and restore the function of tooth shape. The specific step is to use dental drill to grind away the decayed tooth tissue and prepare a certain hole shape, then fill it with filling material to restore its original shape and function. Why is it better to fill the tooth as early as possible? If you have caries, you should repair it as early as possible, because after repairing the cavity, you can stop the development of caries, restore the function of the tooth as early as possible, and keep the integrity of the tooth. If not treated in time, the lesion will become bigger and bigger, from superficial caries to deep caries, and it will be sensitive to food stimulation such as cold, hot, sour and sweet; when the damage reaches the pulp, it will cause pulpitis, and then the tooth pain will be very serious; when the lesion develops further, it will cause apical inflammation, periapical abscess, and even jaw bone pulpitis, and the tooth will fall off and be lost. Tooth decay or even missing will affect chewing, increase the burden of gastrointestinal, and then affect the health. Moreover, there is a large amount of bacteria and pus in the tooth decay, which is a potential lesion, and it can cause sepsis or bacteraemia when the body’s resistance decreases. And filling can terminate the occurrence and development of these lesions, so when you have caries, you should fill the teeth early. In addition, due to the clinical manifestation of caries, it is divided into primary caries and secondary caries. Acute caries is a kind of primary caries, and its lesion progresses quickly. In children or young people, the lesioned tooth tissue is light in color, soft and moist, and the pulp tissue cannot or rarely forms restorative dentin due to the rapid lesion, so it is easy to be infected and pulp lesion occurs. At the same time, children with caries have hindered food chewing and food digestion and absorption, and its effect of stimulating jaw bone growth and development decreases due to the decrease of chewing power. Patients who receive radiotherapy on face and neck, patients who suffer from dry syndrome and patients who have reduced salivary secretion due to other reasons, their caries develops rapidly and often involves most of the teeth, which is called fierce caries. For these patients suffering from acute caries and fierce caries, they should be treated with filling as early as possible to stop the rapid development of caries. Nowadays, the grinding machine is a high-speed turbine machine, which can reach several tens of thousands to hundreds of thousands of revolutions per minute, and the drilling needle used is a steel drill of lynx, so the small cavity can be drilled and shaped quickly, and the patient has no pain. However, when treating larger or deeper cavities, although the speed and cutting and grinding ability of the machine are the same, but because more tooth tissue is destroyed and more dentin is exposed, the more obvious the dentin allergy symptom is, and the closer to the pulp cavity, the more painful it is. If the decay has affected the pulp and inflammation, then the pulp cavity must be drilled for pulp treatment, which is called “pulp opening” in medical terminology, and the pulp opening is so painful that it often needs anesthetic. And further treatment is needed in the future, which is time-consuming and laborious, and the cost is also greatly increased, so we propose regular oral examination, early detection of tooth decay and early treatment. Why do fillings sometimes take several times to complete? When people ask the doctor to fill their teeth, they hope to finish it once. For patients with superficial caries, medium caries and partial deep caries, when there is no toothache symptom after removing the decayed tissue, it is possible to implement the immediate filling method. However, if the patient with deep caries has painful symptoms in the past, the postponed filling method should be carried out after the decayed tissue is removed, regardless of whether there is spontaneous pain or not, in this case, the filling cannot be completed at once. The immediate filling method is to fill the cavity immediately after preparing the cavity, but before filling, the cavity bottom and cavity wall must be disinfected with drugs with small irritation (such as camphor phenol, phenol, eugenol, etc.); if there is no carious dentin at the bottom of the cavity, the cavity can be covered with a layer of zinc oxide and clove oil adhesive powder, then a layer of zinc phosphate adhesive powder is used to pad the bottom, and finally the cavity is filled with permanent materials (such as silver amalgam, etc.). Delayed filling method is to first seal the bottom of the cavity with drugs, temporarily seal the drug and then observe 7-10 days, if there are no symptoms and the pulp vitality test is normal, then fill the cavity. This method is suitable for those who have a small amount of necrotic tissue left at the bottom of the cavity. If there is slight symptom after sealing, seal again and observe for 3 months, if the symptom disappears and the pulp vitality test is normal, fill after capping the pulp. If the symptoms are heavy and there is spontaneous pain after sealing, or there is no symptom after sealing, and the symptom is aggravated when observing for 3 months again, the pulp should be opened and treated as endodontic disease. If the caries develops into pulp disease and periapical disease, the treatment will be more complicated. Therefore, filling can not be completed at one time. Why does toothache occur after filling? Some people are reluctant to get a filling because they have experienced tooth pain after a filling. After going to the hospital for dental treatment, sometimes toothache occurs again, there are probably the following situations. If you understand the reasons, you will know the countermeasures, and you do not have to avoid seeking treatment because you are worried about the pain after a filling. Firstly, if the pulp is inactivated (commonly known as nerve killing) for treatment, toothache may occur on the day or the next day after the inactivation drug is sealed, but the pain will not be severe and will not last for a long time. Secondly, the pain may be caused by stimulating the pulp during the process of preparing the cavity or the disinfection medicine, and the pain of hot and cold irritation may appear for a short time, which does not need special treatment and can generally recover by itself after 1~2 days. Thirdly, if the cavity is deeper, the cushion material used is too thin and cannot isolate the hot and cold stimulation conducted by the silver amalgam, and the symptoms of hot and cold stimulation pain will appear. It is necessary to thicken the cushion material and then make filling. The cause of irritation pain or spontaneous pain after filling in the near future may be caused by some chemicals in the filling material that irritate the pulp or apical tissue, or may be caused by incomplete pulp inactivation. The cause of pain in the distant future is often secondary caries complicated by pulpitis, and pulpal appeasement should be performed depending on the case. When the caries of the tooth has not yet reached the pulp tissue, but has approached the pulp cavity, and when removing the decayed tissue, the affected tooth is extremely sensitive, sometimes accompanied by mild pain; or in daily life, only when encountering cold, hot, sour, sweet and other stimuli, the tooth appears pain. “Soothing treatment” refers to the treatment done to relieve and eliminate these symptoms without damaging the pulp tissue. If there is a recent painful bite, most likely the filling material is too high and the bite is caused by early contact. It can return to normal after a few days of conditioning. In conclusion, except for temporary toothache (such as pulp inactivation) that the doctor clearly tells the patient may occur, all other cases of toothache that occur after filling should be seen in the hospital in order to find out the cause and deal with it in time.