A toothache that hurts as soon as you bite is considered to be related to factors such as an occult fracture of the tooth and apical periodontitis. It is recommended to make a clear diagnosis and carry out treatment through crown restoration and pulp drainage, which can help to relieve the pain. 1. Concealed fracture of tooth: Under the influence of various factors, the tissues of the tooth body are cracked, and when the tooth bites, it may cause pain due to the local force. It is recommended to go to the hospital dentistry for root canal filling, if necessary, porcelain or all-ceramic crown restoration treatment. 2. Periapical periodontitis: you can go to the hospital for radiographic examination to find out whether there is inflammation at the root tip of the tooth, if there is inflammatory secretion destroying the alveolar bone, you need to open the pulp and drain under local anesthesia to complete the root canal treatment. If the tooth hurts when you bite it, consider that it is related to the above factors. It is recommended to go to the stomatology department for examination to find out whether it is related to dental diseases and to give targeted treatment.