Croton lechleri! It's been used traditionally for a lot of stuff and the active constituent is in an orphan drug to help GI issues with cancer. It helps wounds of all sorts and gum issues.

You can find the oral irrigator/toothbrush combos for looking for faucet oral irrigator on amazon. Maybe I'd misremembered the shower ones that are harder to find for the combos of both, but they're easy enough to find for a faucet adapter.