Yes hang in there. We did a lot of things to "help" with the diaper and teeth struggles multpile brushes (for choice) chooseing her own diaper songs allowing her to brush my teeth changing standing up toys, TV character toothpaste etc etc and they all had various degrees of success.. Some days though I just had to make it happen wet diapers resulted in severe rashes and fast and I feel oral health is important enough that if needed I would as gently as I could yet firm enough I didn't also get hurt hold her down and change or brush her teeth.
It does get better even with my late trainer it did get better and now she loves to brush her teeth
Deanna