I think my mouth is doomed. I have MS, but I have also suffered from burning mouth syndrome for over a year, I have TMJ as well, and I had dry mouth (possibly due to being a mouth breather and taking Amitriptyline for the burning mouth).
In any event, I noticed a few months ago, the gums between my 2 bottom teeth (middle teeth) isn't 'protruding' like the others do, it's almost like it's being dented inward. Hrm. If I examine the area below the 4 middle teeth at the bottom, the outer 2 teeth of the 4 have a whitish color 'bump' under the skin that's raised. Not painful. My dentist looked at it and asked if they were painful, I told him no.
Below that, in the area where the bottom of the palate meets the bottom of the lip (the crevice), it's a darkened color. I've tried to find comparison photos on the net, without much luck. Most of the photos of dentistry that I find are extreme cases, nothing at all what mine looks like.
Now, I am a smoker. Yeah, I need to quit. I read that smoking can cause darkening of the gums. Could this explain the darkening in this area? The white things under my 2 teeth... someone suggested tori or torus. If you ask me, I'm more prone to believe that the gums in the area are receding.
Unfortunately I have not been able to return to the dentist since that appointment last summer, due to going through my MS diagnosis, and following that tons of other appointments with GP, neuro, chiro, etc.
I practice good oral hygiene. I brush with Biotene for the dry mouth. I have Biotene oral gel drops for the dry mouth. I drink a lot of juice and water. When I floss, my gums don't bleed at all, and I floss daily. The gums are otherwise pink and healthy looking.
I had a complete blood work up in February to rule out tons of things, including autoimmune diseases, diabetes, thyroid, and vitamin deficiencies. My neuro called me 'the picture of health' as far as blood work goes.
I'm completely baffled by the darkening in this 1 location in the crevice, and the white protrusions below these 2 teeth. Any ideas?

None of that's painful. The burning tongue/insides of cheeks and around my upper gums is definitely no picnic, but Clonazepam and Amitriptyline is keeping the pain to a dull roar or non existent now, thankfully.
Oh, and I also have had geographic and fissured tongue since I was a child (seems acidic foods/drinks trigger these off) and canker sores (acidic, specifically orange juice, causes them without fail).
So my mouth is a bed of activity hehe!