Sore and soft teeth are usually caused by external stimuli such as cold, heat, acid, sweet and other factors that lead to dentin hypersensitivity, and the symptoms are sore and weak teeth when chewing food. According to the cause, it can be divided into physiological and pathological, which need to be addressed. Physiological tooth soreness and tenderness can be relieved by drinking water and rinsing the mouth after eating cold or sour food. Pathological tooth soreness and softness are mostly due to various causes of dentin sensitivity, including tooth wear, wedge-shaped defects, caries, etc. Factors such as excessive fatigue, menstruation, pregnancy, cold, etc. may also be induced, and the symptoms can be relieved by local application of fluoride toothpaste, followed by medical treatment: 1. treatment. For the treatment of caries, it should be decided according to the degree of the disease, and those who have not exposed the nerve can remove the necrotic material and use resin material for restoration, and those who have exposed the nerve need to carry out root canal treatment and wear crowns; 2.Desensitization treatment: for tooth sensitivity, professional anti-sensitive drugs such as fluoride and protein coagulant can be used, or improve the symptoms through laser desensitization treatment; 3.Extraction: if the tooth suffers from pulpal apical disease, periapical disease, caries, etc., which causes the tooth to become sore and soft, the tooth should be extracted. If the tooth suffers from periapical disease, caries, etc., which causes the tooth to be loose and cannot be retained, or if the tooth defect has caused the tooth to be severely fractured longitudinally, the affected tooth can be extracted according to the lesion to avoid aggravating the symptoms and affecting the growth of surrounding teeth; 4, other: pay attention to dental protection on a daily basis, brush your teeth regularly every day, avoid eating too cold, too hot and too acidic food to reduce the stimulation of dentin. Regularly go to the dentist to check the dental health, once the caries occurs, promptly carry out treatment.