FODMAP-safe mouthwash???

I’m getting braces soon and I want to be able to use mouthwash, but I can’t find anything that doesn’t contain some kind of FODMAP-loaded sweetener. Is there ANYTHING I can use??? And if there’s nothing I can buy, does someone know how I can make my own or something (I tried water and peppermint oil, but… YEEEUUUUCH!!!)?