Along with the others suggestions you can look into oil pulling.
Basically, put coconut oil in your mouth & squeeze it through & all around to remove things. It feels odd at first, IME. Did it in the past though.
Discussion
I keep hearing about oil pulling but what do you mean squeeze it through?
Spoonful in mouth & you move it around your mouth completely. What I mean by squeeze through is you push it back & forth between your teeth. Does that make sense?