I started very early too with cloth. I m using the same brush you mentioned that can be wore on the finger. But he refused to open his mouth. He only likes to use the pigeon toothbrush now which I felt that he is not really cleaning. The tongue still got white patch after milk. Sometimes I forcefully squeeze my finger in to wash his tongue. He is really angry n cry a lot.Hrm...we started very early, so maybe the habit was formed. After using the cloth in the beginning, we moved to those brush that you can wear on your finger once there were teeth. Now our LO uses the pigeon toothbrush. The stem is quite thin (but sturdy), so maybe you can slip into the mouth?