Gums red pain teeth itchy have been trying to bite hard, may be the manifestation of certain diseases, such as gingivitis, periodontitis, dental calculus, etc. caused by itching want to relieve by biting things, should be timely consultation to find out the cause of the disease. 1. Gingivitis: inflammation of the gum tissue caused by plaque and other factors, mainly manifested as the edge of the gums red, dark, some patients may feel the root of the local itching, swelling, discomfort, bad breath and other symptoms. 2. Periodontitis: a chronic infectious disease of the periodontal tissues caused by plaque biofilm, the gums can be bright red or dark red, soft texture, can be accompanied by edema of the gums, which may also lead to itchy gums, and some patients will bleed, overflow pus, and so on. 3. Calculus: when the calculus deposition reaches a certain level and time can be calcified and hardened, persistent stimulation of periodontal tissues, oppression of the gums, hindering the surrounding blood circulation, can cause periodontal infection, resulting in gum redness, swelling, itchy, bleeding, bad taste in the mouth, chewing weakness and other symptoms. In addition to the above factors can not be ruled out other factors, it is recommended that the patient timely consultation by the doctor to clarify the cause, give targeted treatment.