The reasons for itching inside the teeth are as follows: First, a large amount of calculus deposited in the neck of the teeth can continue to the root surface of the teeth, stimulating the proliferation of granulation tissue, causing swelling and bleeding of the gums and producing itching and pain. Second, when the teeth are often embedded with food fiber, it can trigger the gingival papillae to be congested and swollen, and the capillaries to be proliferated, resulting in irritation and pain. When the cavity in the crown of the tooth is not repaired in time, the surrounding gums can enter the cavity and form gum polyp, producing itching and swelling. 4.When the cavity of the crown is penetrated with the pulp cavity, the pulp will proliferate rapidly under the chronic stimulation of a large number of bacteria, forming pulp polyp, filling the cavity, continuously oozing blood, accompanied by itching and pain or forming erosion.