Pain in the left side while chewing.

I am going to get dental braces. My dentist suggested extraction of 4 teeth, premolars due to crowding. He extracted 2 teeth on my ride side and gave me a resting period of 3 days before he could extract the other 2 teeth. The Right side is my dominant chewing side, but I have to now eat from the left side. There is a sharp pain when I chew from the left side, and it still pains when I am touching the teeth on that side. What could it be?

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