<s>[INST] I have a pus smell coming from my mouth and a bad smell with my breath. I have a lump like in my throat which cannot be swollowed down I often get a headache in my left frontal part of my head. I have a crown fitted on my left pre molar and there is a pocket also there which has a pus smell But I have been having this for about 3 ore 4 years [/INST] Hithe pus smell is obviously due to pus formation in your gums. This chronic infection has led to localized lymph gland swelling which is feeling like a lump. Headache is also due to inflammation and infection in your gums. The best way to get rid of this problem is to get the proper and immediate treatment .get the dental OPG done .OPG will give the dentist an idea about the bone level around your teeth. Then ask your dentist to Chat Doctor.  don't postpone the much-needed treatment. Take care. </s>