We certainly remember the day our local dentist walked into our kindergarten class and discussed toothbrushing. We sat contently listening as he explained the dangers of "bad bugs" in our mouths. His visit ended by his giving us some tiny purple tablets we were to chew up, swish around our mouth and spit out. The tablets would leave a nasty filmy residue on our teeth, showing us the places we missed in our early brushing experiences.While it seems as though back then oral hygiene wasn't really introduced to children until preschool, today good tooth care is paramount for all ages. Our son is now at the point where he can brush his own teeth every morning and right before going to bed -- although sometimes, it's a bit of a struggle.