Final answer:
The esthetician should not prebook the client's next appointment at the completion of a basic facial.
Step-by-step explanation:
In a basic facial, an esthetician performs several actions to provide a thorough treatment. However, there is one action that the esthetician should not do when completing a basic facial, and that is d. prebook the client's next appointment. Prebooking the client's next appointment is not typically done at the end of a facial, as it is usually left to the client's discretion and availability.