One thing that IS known to help regrow gums is COQ10. And studies have shown COQ10 in an oil base has a much amplified effect.
I confirmed that myself using liquid COQ10 along with my oil pulling. Taking maybe 30 mgs of COQ10 in oil while pulling had a MUCH more powerful effect than the 200 mg capsules of Q10 I was taking before.
The capsules barely registered an effect while the much lower dose added to my OP put my energy through the roof and caused a tingly sensation.
In fact any day that I went without sleep, I'd always do the Q10 oil pull and I'd still be able to work like a champ all day.
I had severe gum receding and 20 years ago a dentist told me I'd likely have almost no teeth in 10 years. Not so at all and I attribute that to the COQ10 (especially mixed with OP).
We talked about this quite a bit in this forum a year or two ago.