The dentist must do only those things consented to by the patient:

Consent is defined as permission given to perform recommended treatment. Documentation is the best way to avoid legal problems with patients. No matter how many consent forms are signed by a patient, the court will take into consideration that most people put their signatures on a piece of paper without fully understanding what they are agreeing to. And dental terminology feels very foreign to patients which a judge will also take into consideration.

There are FIVE requirements that make consent valid:

1. The consenter must be legally competent