Is it safe to get a BBL after dissolving old fillers?

Having had previous HA fillers should not be a big deal for having a BBL. Each plastic surgeon will have their own thoughts about it so I suggest you have a few consultations and see what each provider has to say first hand.
Make sure you’re a good candidate for the procedure in the first place and vet providers carefully to choose the most talented and experienced provider.
Do this by asking each provider to show their entire collection of before and after pictures to make sure they have high-quality results on a regular basis.
Delivering consistent high-quality liposuction and fat transfer results is more difficult than most people believe.
Best,
Mats Hagstrom MD