Gums often have pus after dental fillings but the tooth does not hurt may be caused by periodontal abscess, apical periodontitis, gingivitis and so on. 1. Periodontal abscess: when the patient’s deep periodontal pockets within the wall of purulent inflammation to the deep connective tissue expansion, pus can not be discharged to the pocket, the formation of pockets within the soft tissue of the abscess, resulting in the patient after dental fillings gums often have pus but teeth do not ache the situation, accompanied by localized swelling of the gums, tooth loosening and other symptoms. 2. Periapical periodontitis: when patients are subjected to physical factors, bacterial infection and chemical stimulation, which will lead to periapical tissue damage, inflammation, patients often have pus in the gums after dental fillings, but tooth pain, the patient is mainly manifested as a localized abnormality and dysfunction, there will be discomfort when chewing. 3. Gingivitis: when the patient’s gums after dental fillings often have pus but teeth do not hurt may be due to gingivitis, is caused by plaque as well as other factors of inflammation of the gum tissue, if the inflammation appears to be further expansion, will also cause deep periodontal tissue lesions, become periodontitis. It is recommended that patients go to the regular hospital in a timely manner, under the diagnosis of the doctor, according to the patient’s condition, to take targeted treatment, pay attention to oral hygiene in life, and brush your teeth diligently.