Patient: recently appeared teeth ate sweet things allergy – pain laboratory, 2008-8-23 went to see the doctor, he did not have an effective solution, the doctor said that the main reason is that my teeth did not rot, perhaps the tooth the outermost layer of the protective layer of decay, he helped me to remove the layer. The doctor tried to put some medicine on my tooth, which made it better, but it is still the same as before and has worsened: it is more sensitive. I would be grateful if you could help me to diagnose the problem and give me good advice! Ling Jianjun, Endodontics, Beijing Stomatological Hospital: You said that your teeth hurt when you eat sweet things, and if there are no insect teeth in your checkup, then it is likely that you have dentin hypersensitivity. The main reason for dentin allergy is that the surface of the teeth (enamel layer) is heavily abraded or local enamel loss, external stimuli will cause the teeth are not, but this feeling is generally not persistent, the stimulus is removed, the symptoms will disappear, and the symptoms are sporadic. Treatment is generally used in drug desensitization approach, but the effect of desensitization varies from person to person, some need to be repeated on to be. There are several types of desensitizing medications, depending on whether your dentist has the appropriate medication. If there is a significant localized defect or depression, a filling can be used.