Teeth that are sore from eating sweet things should be a symptom of dentin sensitivity. If the tooth has a wedge-shaped defect, that is, a transverse defect in the cervical region of the tooth, or if the tooth is excessively worn out on the jaw, eating cold, hot, sour, or sweet substances will produce the symptom of sensitivity. This symptom needs to be treated with filling of the tooth, and if it is not possible to fill it, it needs to be restored with a porcelain crown. If there is a hidden crack in the tooth, it will also produce symptoms of cold, hot, sour and sweet sensitivity. You can use desensitizing toothpaste to apply on the surface of the tooth, rinse your mouth after 1-2 minutes of application, and then brush your teeth again. For those who are more sensitive to cold, hot, sour or sweet pain, or for those whose pain is persistent and severe, they need to undergo open pulp treatment, that is, they need to undergo root canal treatment or kill the nerve, and then fill the crown to restore the pain, and then the pain problem can be solved.