CloSYS mouth rinse has really helped my gums. It’s not cheap, but I buy it on Amazon in 32 oz. bottles and only use 1 oz. at a time instead of the recommended 2 oz. I think you can also get it at some drug stores and Walmarts in nicer areas. (There was a whole thing about Walmart wanting to carry it and the company that makes it debating whether they could/should scale up for that, especially when it would be competing with much cheaper options on the shelves.)