Although I don't understand the intention of "cutting teeth", I can give you some advice.

Two people operate, the assistant is responsible for fixation, and the surgeon is responsible for the operation.

The assistant takes a squat posture, fixing his body with his feet and fixing his head with his hands.

With the head fixed, hold the cork with the thumb and forefinger of the left hand, put it in the position of the posterior alveolar teeth in the mouth, and open the mouth.

The other three fingers buckle the mandibular margin and fix the head with the wrist. The main function of the right hand is to fix the head.

After the fixation is completed, the surgeon can perform the operation.