For a week I have had a bad taste in my mouth. I had this same taste about 27 years ago when I was diagnosed with a benign tumor in my sinuses, except back then it was way more metallic. Right now it is more of the taste that a dentist who has just drilled out a tooth , puts that mediciny tasting something in your mouth before he fills it. I can t get rid of this taste. I have brushed and brushed, cleaned my tonsils, not eaten pine nuts , so I don t know.