Temple augmentation with hydroxyapatite, too good to be true? Desperate for second opinions!

In our practice, we use soft tissue fillers like Radiesse, Sculptra and/or fat grafting for lifting the brow, filling out the temples, and making the face appear more youthful. I use water-assisted fat harvesting which gives pure fat to transfer and combine with platelet rich plasma (PRP) to get the most viable and sustainable fat cells.
I suggest getting a formal consultation with a cosmetic dermatologist and facial sculpting expert. Best, Dr. Emer

It seems to be a permanent filler. As such it provides volume that lasts for long time (forever?) but carries the risk of infection, foreign body reaction (granuloma) with irregularities, lumpiness. Another option is injection of fat grafts; it is your own tissue and will not create any problems by means of infection and rejection. In person evaluation is recommended.

There are many ways to perform temporal augmentation and they differ in both implantation location (on the bone, in the muscle or on top of the muscle) as well as the materials used to do it. While all temporal augmentation methods provide some improvement they do not produce aesthetically similar results. What you are referring to is the use of a synthetic bone graft placed deep on the temporal bone surface. This approach has the least aesthetic improvement because it is very deep to the external surface with thick overlying soft tissue layers. It tales a lot of material to push outward to create much change. The use of synthetc bone granules 'pushed' or injected onto the temporal bone hollows is associated with irregularities and clumping because it is not a controlled placement. Creating a completely controlled shape and desired amount of augmentation is very difficult or impossible. When bone grows into the material it can be difficult to remove later should a revision be needed. I have removed such materials numerous times in patients in revisional surgery to replace it with a more controlled implantation method closer to the temporal  external surface. (subfascial muscle location)