Laser Ablation on the Gum Line - Temporary?

I had my gum line reduced by laser ablation a couple years ago for cosmetic enhancement. The results appear to have only been temporary; my gum line looks the same now as before the procedure. It kind of just grew back. The dentist did not mention whether the results would be permanent. Would this kind of procedure's results typically be permanent, or could they heal back to former appearance just like any other wound? Only had one laser ablation procedure, and it was fairly subtle.