As a child I was allowed sweets once a week and now have pretty good teeth. DH was allowed free rein and subsequently had 4 rotten front teeth bby the age of 4.
I thought I would be less militant than my parents with my DC's and allowed them biscuits and chocolate - no sweets or fizzy/sugary drinks though.
DD is 6 and has just had 3 fillings, we now allow them a chocolate bar on saturdays but I feel terrible.