Having rheumatoid arthritis, you get a number of complementary problems, such as gingivitis, so rather than use all those chemical mouthwashes, I've been making an herbal mouthwash with essential oils that are used for this problem.
It's less expensive and I use the essential oils for countertop spray to avoid chemicals also. Essential oils are very antimicrobial.
Here's one of the recipes I've used for the mouthwash. I take an empty 8 ounce bottle with a flip top lid (mine is from Frozen Lemon Juice). I add 6 ounces of purified water, 2 teaspoons of glycerin (optional for sweetness), and for essential oils for healthy gums, I used 7 drops Rosemary Essential Oil, 7 drops Thyme Oil and 7 drops of Peppermint Oil. You can find the glycerin at a drugstore. In our area it was one of the family-owned ones.