Eating cold and hot teeth pain, may be deep caries, dentin hypersensitivity, wedge-shaped defects, pulpitis, etc.. 1. Deep caries: deep caries when the tooth caries to the dentin deep, eat cold hot food will stimulate the dentin tubules, causing transient tooth pain. 2. Dentin allergy: Dentin allergy will cause tooth sensitivity when it is stimulated by hot or cold, which will result in hot and cold stimulation pain. 3. Wedge-shaped defects: wedge-shaped defects usually occur in the neck of the tooth, the neck of the tooth is more sensitive, encountering hot and cold stimuli will cause pain. 4. Pulpitis: further development of dental caries, trauma, etc., bacteria invade the nerve, resulting in inflammation of the pulp, which can cause pain from hot and cold stimuli. There are other reasons for eating cold and hot teeth pain, it is recommended to go to the hospital in a timely manner, after clarifying the cause of the disease, symptomatic treatment to alleviate tooth pain.