Tooth sensitivity can be caused by tooth sensitivity, gingivitis, periodontitis and other reasons. 1. Tooth sensitivity: It refers to tooth sensitivity caused by external stimuli such as cold, heat, acid, sweet, friction or biting hard objects, resulting in tooth hypersensitivity, which is usually short-lived. 2. Gingivitis: Gingivitis caused by lack of attention to oral hygiene, calculus and plaque stimulation may lead to tooth hypersensitivity. 3. Periodontitis: tartar stimulation of the gums leads to periodontitis, which may lead to toothache, and may also be accompanied by weakness in chewing. There are many reasons why it is hard to tell what is wrong with your teeth. If it lasts for a long time and is more serious, it is recommended that the patient go to the hospital in time to get a clear diagnosis and treatment under the guidance of the doctor. Daily attention to maintain oral hygiene and cleanliness, avoid eating irritating food.