i've not yet utilized the method of "plugging in a search word" to get previous info on any subject, so bear with me - my dad just called yesterday and told me that at his 6 month check up with the dentist - they found 16 cavities - 6 months ago there were none - granted, my father loves sweets and eats them often at night (or when he wakes up in the middle of the night) and doesn't always rinse his mouth out - but this has been going on for a couple of years (the night treats, i mean) AND he daily uses the highly recommended SONIC toothbrush - what would cause such a dramatic difference all of the sudden? thanks much - cari daughter of. . .