Final answer:
The dental hygienist is following the principle of autonomy by giving the patient the option to make their own decision about the treatment.
Step-by-step explanation:
The statement 'Please think about it and let us know whether you'd like to receive the treatment' made by the dental hygienist indicates that he or she is following the principle of autonomy. The principle of autonomy states that patients have the right to exercise agency or self-determination when making decisions about their own health care. The hygienist is respecting the patient's autonomy by giving them the option to think it over and make their own decision.