<s>[INST] hello. I keep getting a strong metallic taste in my mouth, especially behind one tooth, and the tip of my tongue tingles as it would if I had burned it on coffee, but I haven't had anything hot. I have not had a change in diet and I am not taking any new medicines. I quit smoking two weeks ago. Any ides on what this might be? [/INST] helllo thanks for consulting at hcm..usually metallic taste and tingling sensation results from various vitamin deficiencies..like iron, vit B12 ETC,, so plz consult a general physician for a complete blood check up and treatment,,,If YOU are middle aged,with stress factor-- it might also be because of burning mouth syndrome,, and also you recently quit smoking too..so may be you are having relapse episode???either ways plz consult a oral physician and general physician for a check up and treatment,,hope it helps,,take care,, </s>