Gums become yellow like rotten may be caused by oral ulcers, periodontitis and other diseases, need to take medication, physical therapy, surgical treatment for the cause. 1. Oral ulcers: yellow gums like rotten may be caused by oral ulcers. Patients can follow the doctor’s instructions for local topical pain medication, such as lidocaine gel, compound benzocaine gel, etc.; or oral vitamin drugs, such as vitamin C, vitamin B complex. 2. Periodontitis: yellow gums like rotten is also considered to be due to periodontitis. Periodontal treatment can be carried out to alleviate the symptoms of gums. Gums become yellow like rotten may also be more calculus, accumulation in the gum margin. This can be treated with supragingival scaling and subgingival scraping. There are many reasons for yellow gums like rotten, we suggest that patients identify the cause of the disease, and actively cooperate with the doctor to take treatment measures.