RADIESSE is my preferred product for cheek enhancement and it really varies how much each patient will require to get the look they would like. It depends on how flat or sunken their cheeks are and also how much fullness they desire. As a BOARD CERTIFIED DERMATOLOGIST I inject many patients every week with fillers for cheek enhancement, so it is not necessary to see just a plastic surgeon.
I would make sure however that whomever injects you has a lot of experience with injectables, especially in cheeks. Injecting cheeks is an art and it can be done well or it can be done poorly. Make sure you like that doctor's work and ask for photos if you don't have a personal recommendation. Not every doctor is good at everything and one may be great at face lifts and poor at fillers while another may be great with fillers and not good at nose jobs. Also, some physicians don't even do the injectables themselves but delegate it to their nurses, so make sure you know how experienced the person injecting you is, not just the doctor they work for.