Hi Nan,
Studies on how long Radiesse lasts have shown it to last for between 9 to 15 months. Many patients who would require 2 or 3 syringes for the proper correction, insist on only having one syringe for economic reasons. Many facial plastic surgeons won't even inject only one syringe if what you need is two or three because the surgeon doesn't want an unsatisfied patient speaking ill of her/his treatment.
In the case where one syringe will not lead to enough correction, after the initial swelling resolves, the patient may think that the filler did not work, or has disappeared prematurely. This is all based on the premise that they actually received authentic Radiesse and not a cheaper, shorter lasting subsitute filler.
Now if you didn't get enough correction the first time around, and more Radiesse is added to the already existing filler, it may appear to last longer. Some patients may need only one syringe for complete correction while the majority will benefit from more than one syringe. Good luck.
Dr. P
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