Bioclear or gum graft for my black triangle? (Photo)

Hello, I developed a black triangle on my upper near front teeth after a second treatment of braces. Anyways, it has been that way for few years now and I have not see a dentist in about 4,5 years. I’ve thinking of gum graft to cover that gap or should I get the new bioclear method? Do I have a healthy gum? I know the gum receded or the gum between those teeth shrunk away during braces. Im not sure. But the dentist that I’ve seen told me no bone loss on those teeth. Thanks in advance!