I Have Had A Problem With My Left Ear For

I have had a problem with my left ear for over a month now and i don't know why. It's the feeling you get when you get water in your ear when you 're washing your hair and it eventually goes away... well this is not going away and it's ben too long... It occurred to me the other day that it might be related to my dental work that I've been having done since about the end of April. I am having some work done to close some gaps in my teeth using invisalign and the shifting that I feel is on the left side when I bite down as opposed to the right side and that is the ear that I cannot hear out of, or should I say I can barely heart of it. It gets more muffled in the evening. Could this be related to my dental work?