Itchy teeth want to bite things may be caries, periodontitis, periapical lesions and other diseases. 1. Dental caries: due to bacterial infection and other causes of dental tissue destruction, caries is more serious, there will be dental inflammation, inflammation and infection will make the teeth itch and have the desire to bite. 2. Periodontitis: after periodontitis, there will be localized redness and swelling of the gums, bleeding after stimulation, dental calculus, plaque and other local stimuli, which will cause the root of the teeth to itch, and always want to bite things. 3. Periapical lesions: after periapical lesions, there will be inflammation to the apical part of the penetration, resulting in the apical part of the root will have the discomfort of biting, or the root of the tooth itchy, there are symptoms of biting. Itchy teeth want to bite things may also be seen in gingivitis, endodontics and other diseases, if the symptoms of itchy teeth want to bite things, persistent unrelieved, need to seek medical treatment.