If you want permanent results with F&F order the custom made formulas. It costs between a thousand or 2 per month for 3-6 months to get permanent results. I was told 3-6 cycles of skin regeneration.
It’s VERY expensive but besides that or monobenzone (which completely depigments your skin) that's the only thing that will give permanent results
Any used the custom made formulas form F&F?