Umm. 
Horses for courses?
I've used Peppermint flavoured Dr. B for years, now: teeth, hair, pots etc.,
It's a bit of an acquired taste, I guess, but a 25 ml bottle will do me 2 weeks of varied use.
Not sure if Peppermint is so much different to Mint, but, it's what I read (years ago) was the recommended flavour best suited for teeth cleaning. I put just a very tiny dab on the toothbrush, as it is pretty concentrated.