Had a root canal on my right bottom molar by an Endodontist on last Thursday.Had to be injected 5 times; and now I can't open my mouth wide.I have been taken Clindamycin 150 MG; and Advil OTC. Just yesterday, I was given Flexeril 10MG. A simple task of brushing my teeth in unbearable!!! Please tell me what happened. My tooth feels fine but my JAW feels AWFUL!!