Teeth are afraid of heat and cold, indicating that the teeth are sensitive to temperature stimulation, which can be seen in pulp inflammation or dentin sensitivity. Generally, the effect of medication is not obvious, and root canal treatment or desensitization treatment is needed. Fear of heat and fear of cold is common in reproducible pulpitis and non-reproducible pulpitis. Different degrees of inflammation in the pulp, need to go to the hospital after examination of irreducible pulpitis root canal treatment, put anti-inflammatory drugs in the root canal. For reproducible pulpitis, topical application of clove oil is also required to eliminate the inflammation of the pulp. It can also be caused by tooth sensitivity, which is a fear of cold and heat, and usually requires desensitization instead of oral medication. Teeth are afraid of cold and heat, generally dental disease, it is recommended to go to the hospital in time for examination and treatment, the use of drugs need to follow the doctor’s instructions.