I had Radiesse injected into the dimple/crease in my chin. About 2 mo later, I noticed what appeared to be a growth in my mouth, behind my lip. I went to the dentist and was then sent to an oral surgeon for a biopsy/stitches etc. They thought it looked like sweat glands but wanted to be sure. Biopsy came back and turns out it was foreign material (radiesse) that had leaked into my mouth.
I did this to soften the indentation in my chin. There are really no pros as it was expensive, did not make much difference and now it is leaking in my mouth.