Before the baby is about to teething, there are several symptoms: 1, there may be itching or pain in the bed of the teeth, easy to bite fingers or bite toys, it is recommended to use a teething stick to relieve the teeth of the distension of the discomfort of the itch, and there may be drooling, biting, irritability, easy to cry phenomenon, the bed of the teeth may appear to be broken, red and swollen, and there may also be a fever phenomenon; 2, the eruption of the permanent teeth may occur Gingival eruption abscess, need surgical incision to help teeth eruption, and need to maintain oral hygiene; 3, there may be peri-coronary abscess, can be localized rinsing, and appropriate oral anti-inflammatory drugs. When teething, the phenomenon of retained milk teeth and ectopic eruption of permanent teeth may occur, and the retained milk teeth need to be extracted, and after all the permanent teeth come out, orthodontic treatment can be done to align the teeth, which is good for the occlusion and aesthetics.