Teeth hurt when they touch sweet, may be deep caries or dentin sensitivity symptoms caused by excessive tooth wear and wedge-shaped defects. 1. Deep caries. Deep caries due to the proximity of the pulp cavity, the teeth will be outside the hot and cold sweet and sour discomfort, soreness, general removal of decayed tooth tissue, medication cushion resin filling symptoms will disappear. 2. Dentin sensitivity. Excessive tooth wear enamel loss, wedge-shaped defects dentin exposure can be caused by the flow of liquid in the dentin tubules, causing dentin sensitivity symptoms, the outside world of sweet and sour or mechanical stimulation to produce a sense of pain, general resin filling, isolated from the outside world of stimulation after the symptoms will disappear. If your teeth hurt when you touch something sweet, it is recommended that you go to the hospital in time for examination and find out the problem in time.