I feel like i have a very thin, clear substance coating my teeth. i can feel it with my tongue and fingers, but can't see anything there. help!

See your dentist: i can't really guess but if you have not seen the dentist for a while you should, this could be some kind of biofilm which is made,of,bacteria mixed with plaque, it could indicate a serious infection of your gums and the bone supporting your teeth. The bacteria is hiding deep under the gums and need to be removed professionally.

Plaque: is a sticky mix of bacteria and the mucopolysaccharides that the bacteria secrete. It’s a normal preventable occurrence by brushing your teeth right after a meal.