There is an herb that is very helpful for gums and for strengthening teeth. It is called White Oak Bark. I buy it from Nature's Sunshine Products (of course) in a capsule form. Then i open the capsule and put the powder into two areas:
#1 I mix at least 1/2 tube of toothpaste in a glass jar (that I've cleaned and sterilized) with 3 capsules of White Oak Bark and 3 capsules of Black Walnut powder, and 1 teaspoon of colloidal silver. All of these are from Nature's Sunshine.
#2 if I have any pain, tooth or gum, or even if there is a cavity, I put about 2 capsules worth of the white oak powder into a tea bag (dump out the old tea). Then I dip this tea bag in hot water for about a minute, to moisten and activate the herb. Then I roll the tea bag closed and place it between the gum and the cheek. It provides almost instand relief. If you suspect any infection you could add a drop of clove oil (only one drop) or a drop of Myrrh Essential Oil. Yes I get that from nature's Sunshine also. Some people use Tea Tree Oil.
I know this has worked on many people, even those of us who still have crowns. I hope this works for you too !!
Joanne