I also have a copper taste in my mouth, dentist says no gum disease, I do have post nasal drip but thats never happened to me before I have this awful taste since going on 3 months, my doctor just says could be this could be that but doesn't test me for anything well I started having severe TMJ now that I am almost done with my braces I had the TMJ before, I did some research what I came across so far as a possibility is a pinched muscle or nerve in the area of my TMJ joint, which is to throw off a metal taste, so I really don't know blood work was done so nothing else has came up as being low in iron or zinc. I seen on a tmj specialist site metal taste in mouth so I am really pointing in that direction. I am in braces but I am trying to get therapy now for the annoying ringing sounds in my ears and the ear pain, I can't wait so I am finding someone now that can help me fix this problem..
MS CONTINĀ® - (Morphine Sulfate Controlled-Release) Tablets could cause alteration in taste, ie metal taste. You should contact your MD......not your TMJ doc.
Instead of meds and Trigger Point injections I recommend you find a Neuromuscular TMJ expert. Go to www.top3dentist.com