<s>[INST] My mum has history of decayed tooth in almost all of them (all are black and eroded), she used to chew clay pots in early days and used tobacco based Red tooth powder. She brushes regularly but doesnt use any mouthwash,  Few days back we figured out a severely damaged tooth and visited dentist, he had root canal of it  and suggested that we should go for tooth cap as nothing is left in it. Since that root has been done My mum has regular pain in gums of  next tooth in the area she had RTC of, and few days back gum had a pus formation, antibiotics are already going on but pain is unrelieved. please suggest [/INST] Hi, Thanks for asking the query, According to your clinical history I suspect that your mother is having generalized infection in her teeth. Pian in the root canal treated tooth can be due to re-infection or spread of infection to the adjacent tooth leading to abscess formation. I would suggest you to take an OPG radiograph to determine proper diagnosis and appropriate treatment plan. If required act has to be performed in the adjacent tooth also. Stop the use of tobacco based tooth powder. Use a soft bristle tooth brush and desensitizing toothpaste. Use antiseptic mouthwash rinses. Maintain a good oral hygiene. Hope this helps out. Regards..... </s>