<s>[INST] hi...i had a broken tooth in 2010. the dentist asked me tp extract it but i did not want to so i went to another dentist where she was ready to giv it a treatment. she has made a big hole in my gum and only half the tooth is left. it does not pain but very slightly at times when food gets in the hole. the hole has become a dark colour inside. is this really harmful to my health? [/INST] Hi, Thanks for asking the query, After reading your clinical history I suppose that you have developed severe infection of the tooth. I would suggest you to visit the Dentist take an x-ray of the tooth depending upon which the treatment will be extraction or RCT. Root canal treatment is the procedure in which the entire nerve canals are removed the tooth is devitalized and filled with an inert material. Go for symptomatic treatment of complete mouth scaling and polishing. Maintain a good oral hygiene, use lukewarm saline and antiseptic mouthwash rinses. Hope this helps out. Regards... </s>