[lisper]

> you need to constantly resupply the initial good bacteria for them to keep holding on

Then unless your mouth ends up bacteria-free, the good bacteria are by definition not out-competing the bad ones.

[Obscurity4340]

Is there any reason you can't just propogate and cultivate them in a seperate breeding receptacle for an unlimited supply like people do with SCOBY or whatever for making sourdough and kombucha?