Four-year-old baby caries pain can be carried out oral examination, shooting whole mouth surface tomography, according to the type of disease were treated, the specific treatment is as follows: 1, shallow caries: if the adjacent surface of the milk teeth to form a shallow caries, destruction of neighboring relations, resulting in the retention of food fibers, can be applied to the flosser to remove the food debris, grinding away the decayed tooth tissue, the preparation of cavities, the use of glass ionomer cementum, etc. filling, pay attention to avoid the formation of overhanging protrusion. 2, deep caries: milk teeth produce deeper cavities, hot, cold, sour and sweet stimulation pain, can be removed after removing the decay of zinc oxide clove oil cementum soothing analgesia. Deeper caries: deeper caries in baby teeth, when cold, hot, sour or sweet stimulation pain, you can use zinc oxide clove oil cementum to soothe the pain after removing the decayed material. After the pain is relieved, double-layer cushioning will be carried out to repair the defects.3. Inflammatory problems: If X-rays show that pulpitis or apical periapical inflammation occurs in milk teeth, the pulp cavity will be ground open and removed under local anesthesia, and the root canals will be closed with calcium hydroxide paste after root canal disinfection, and resin or metal preformed crowns will be made to restore the teeth.