You can purchase Gel-Kam over the counter. It has 0.4% (w/w) stannous fluoride. (Other ingredients: Glycerin, hydroxyethylcellulose, flavoring.) I use that a

You can purchase Gel-Kam over the counter. It has 0.4% (w/w) stannous fluoride. (Other ingredients: Glycerin, hydroxyethylcellulose, flavoring.) I use that a few times a month. And, I live in a water district with fluoride in the water.