Gums may recede for any of several reasons, including thin tissue, abnormal position of teeth in the dental arch; malocclusion; inappropriate expansion orthodontics; heavy bite stress; and periodontal disease.
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I am in the dental school,very helpfull!!!
Periodontal disease is the result of China's population leading cause of tooth loss. Early periodontal disease is often only the performance of bleeding and bad breath, tooth decay, but also not as painful. However, according to the National Oral Health Steering Group has revealed in recent years, clinical periodontal disease has been home tooth extraction caused by the first of its total number of 44% of the total extraction.