Many people undervalue what they want to do compared to what they think other people want them to do. They think that they need to be obedient, without understanding or feeling good about why they have chosen to do so. Doing this to yourself is bad enough. But doing it to someone else, such as your child, is even worse, because now it is not just yourself and your own reason you are violating and harming, it is another person.
The dentist needs to know that when our child is having dental work done, if the child raises their hand, the dentist must pause immediately. It is the child’s consent that matters, not the parent’s. The child must be in charge. If it does not seem as though they are to them, then they are not in charge. If they do not have control over the inside of their own mouth, what do they control? Your duty as a parent is to enforce that control come what may.