I got the right side of my face slammed to the grass and now my back teeth wont touch, no swelling no pain.will it go back to normal after a few day?

Have it checked out: There simply isn't enough information to accurately diagnose your condition or predict it's outcome. But malocclusions of the jaw (whether there is pain or not) indicate a serious misalignment of your upper and lower jaws. At the very least, unchecked, you could be placing a great strain on your jaw mucles that will not present pain until it is too late. I strongly advise you to have it checked.

See dentist: Malocclusion is a sign that something shifted during the injury. This is a classic sign of possible fracture but is normally associated with pain, inability to open /close normally. You should get it seen as soon as possible primarily because early intervention of dentoalveolar trauma is key for successful outcomes.