First, the teeth are cracked. Cracked teeth, also known as microcracks, usually refer to tiny cracks (lines) on the surface of teeth that are not easily found by naked eyes. If the crack goes deep into the pulp, it will cause toothache. This is common and often overlooked, leading to dental diseases. Cleavage is more common in middle-aged and elderly people, as well as treated permanent molars and bicuspids. In daily life, people who often like to chew bones and hard food are more common. It is generally believed that cracked teeth are often related to trauma, trauma (sports), repair surgery and so on. Cracked teeth are sensitive to temperature and chemical stimuli, especially to cold stimuli. When chewing, the bite is uncomfortable and dull. Cracking reaches the root surface and apex, which can cause periodontal pocket and periodontal infection. Treatment: 1. Reduce occlusion, reduce the resultant force of medial and lateral occlusion, thus alleviating pain and preventing the development of cryptofissure, leading to fracture or splitting. 2. Prosthetic treatment: In order to repair and protect the cusp, full crown or inlay can be used for restoration. Pay attention to the shape and occlusal relationship of joints. 3. After root canal treatment, full crown can be used for restoration. Note that root canal filling should not be too strong; Prosthetics with piles should not be used.

2. Dentin allergy. More common in men and women over middle age. Refers to the sensitivity of exposed dentin to temperature, chemical and mechanical stimuli, which is manifested as toothache. This is a signal that when teeth are sore, people realize that their teeth are sick and should go to the hospital for examination and treatment. If the tooth sensitivity is too high, there will be lesions. Treatment: 1. When desensitizing drugs are applied locally, the curative effect often varies from person to person. 2. If the drug desensitization is ineffective and the wear is close to the pulp, dental pulp treatment can be considered for full crown restoration.

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