There are lots of reasons why filler may be dissolved.
This may be due to incorrect placement, lumps & bumps, poor results, filler migration, dermal filler side effects, accumulation of hyaluronic acid, or simply changes in aesthetic trends (lips!)
Quite often we see clients who have been dramatically overfilled over the years or had bad placement which can make them lose their own natural bone structure and actually age them significantly & increase sagging.
In these instances the specific areas of filler are outlined and an appropriate dose of hyaluronidase is injected to dissolve the filler.