<s>[INST] Hi. I m a 30 year old male. Recently, I started having a tingling (sore-like) pain on the inside ( tongue side) of my lower gum behind my last molar. When I was examining it myself, I noticed that there seems to be a small hole there. When I scratched at it, it almost feels like bone - it s rather hard and rough. There doesn t seem to be any other issues from what I can see. There may be a little bit of white around it, but it s hard to tell. It s not terribly painful, but it has me worried. Are there some possible explanations for this? [/INST] Hello and welcome to Chat Doctor, your teeth is effected by periodontitis which is localized in nature. The tingling pain is due to sensitivity as a result of gingival recession and pocket formation. White around the tooth is due to deposition of food debris over there which caused the formation of heavy band of plaque called calculus. Visit your dentist and get the cleaning and root planning treatments. Use desensitizing pastes like resident to brush your teeth. Use soft-bristled toothbrush to clean your teeth. Take care. </s>