when the dentist is about to take a x ray of your teeth and he places two pieces of a white things. does he place in in between the front two pieces of your teeth? im worried since i have a small gap in between the top and bottom and hope it doesnt widen it even more? im thinking of getting braces and when the dentist is cleaning your teeth if u have a small gap does it widen since he is going up and down between the teeth?