Black Triangle Closure, Teeth 7 and 10

I have dental implant at 7 and 10--didn't have adult teeth. Had the surgery when I was 13, and now I'm 35. No problems with the implants. I now have small black triangles between the implants and my front two teeth. Hate the look. Saw a perio and he did a gum graft back in December, but only 1 side took--the other shrunk and the hole actually looks worse than before. My dentist discussed new crowns but recommended I see the perio first. Wondering if this could be the answer; just do new crowns.

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