Can anyone can give me toothcleaning tips please? DS is 18mo and won't let me near him with the toothbrush. He clamps his mouth shut and turns his head away. If I persist he starts to meltdown. I have tried different angles and have even devised a catchy toothcleaning song to the tune of "Shake n Vac" but to no avail. His pearly whites are starting to look like they could really use a good clean! Any suggestions most gratefully received.