how is your diet?
Except from doing oil pulling it would be wise to keep ad adequate intake of VIt. C, and fat soluble form of Vit. A,D, K and K2 (either MK7 or MK4, try both of them and see which one fits you best).
At the same time cut down on refined sugars and floss regularly.... for some reason i have the feeling OP does more for Teeth quality and less for gums... another options would be OP during fasting regiments, fasting is famous to help fixing teeth into their sockets if done properly, even intermittent fasting can help to some degree.