I had a gum disease in the period before I was diagnosed (I'd had it for a while, it started when my Mum was dying of cancer and I was quite stressed.), and was having treatment for it up until last December. The dentist (Plus my cleaning regime) managed to remove it completely, although it did require an extraction as one tooth had so much infection under it she couldn't get rid of, but I was having an implant next to it so they said they can make the implant larger to cover the area - my bleeding scale was down to zero at the end of last year. It took quite a while to clear up, but they wanted to sort it before putting implants in (I've had the first implant in last month, and it healed so well the dentist was surprised. He said it doesn't look as if anything has been done.)
I'm wondering if the disease was caused by high blood sugars.