In last month or so,but especially last night whenv brushing and flossing, i've noticed some change on the left upper side of my jaw in area of a couple teeth. When I would use listerine and brush i could feel..like something there in area of that top teeth. Almost like a hollow feeling,but im not sure. Well tonight i could definitely feel how my one upper tooth fits down into the lower tooth below it,felt off. It just feels weird. I do take care of my teeth,floss regularly and brush 2x day. Could it be from tmj? I do have it,and i get popping in jaw,etc..but its not like as bad as lock jaw. i also had fillings put in last year,and i cant remember if i got one in that area or not...like I said it feels like how that top tooth fits into bottom tooth is off,and when i swish liquid its sensitive there and feels like something is there,thats all I know how to explain it..maybe resin based filling falling out?