If done correctly, a Brazilian Butt Lift is permanent
If done correctly, yes, the results of a Brazilian Butt Lift should be permanent. As with any fat grafting procedure, the extracted fat needs to be treated before being re-inserted into the buttocks. And, as with any fat grafting procedure, some of the fat is re-absorbed back into the body in the month or two following the surgery, however, the rest should remain permanent.
I would strongly recommend finding a board certified plastic surgeon who is experienced in...