ds1 is 13 and I'm sick of reminding him to brush his teeth. He would never shower, comb his hair, brush his teeth, anything if I wasn't there to tell him to do it 
I'm really sick of it, but I feel, in some way, responsible for his teeth. It's like they're my teeth because I grew them for him and he should take care of the damn things. He needs to value his teeth and keep them healthy to avoid fillings.
I just can't be bothered to constantly chase him about them. He needs to look after his own teeth now.