The teeth are painful when eating hot or cold, considering hot and cold stimulation pain, indicating the existence of caries, pulpitis, dentin sensitivity and other causes, should be identified to identify the cause of the disease, targeted treatment. 1. Caries: If the pain of hot and cold stimulation is transient, and the pain is mild, and can be recovered by itself after removing the stimulating factors, it is recommended to consult the stomatologist in time, and scrape off the decayed dentin for filling treatment, so as to avoid further deepening of the decay and aggravation of the decay, and development to deep caries. 2. Pulpitis: If the pain caused by hot and cold stimulation is caused by pulpitis, it is recommended to consult a doctor in time for root canal treatment. Because patients with pulpitis have irritating pain, and the degree is more intense, it is suspected that the nerve of the tooth is damaged. Root canal treatment closes the root canal of the tooth to prevent bacteria from re-invading and causing re-infection, and preserves the function of the tooth. 3. Dentin sensitivity: enamel peeling, wedge-shaped defects or periodontitis root exposure, etc., can lead to dentin sensitivity, hot and cold stimulation pain, etc., the need for composite resin restoration, periodontal therapy and desensitization treatment. It is recommended that the teeth eat hot and cold pain in time to see a doctor for examination and treatment.