While babysitting my cousins I taught them how to brush their teeth
That was really nice of you to teach them oral hygenie. Were their teeth really dirty?
Yes, and it was time for them to learn how to brush.
You are a good cousin for properly teaching them oral hygiene. It's never too early to start, as bad oral health can be linked to heart diseases. You need to get them into good habits so they stay healthy.
I don't care about their future health. I just want to teach that mom that she's a terrible parent.
Teaching your cousins how to brush their teeth is a kind and wonderful act. Just be sure to watch your intentions behind the things that you do, or it won't seem like a good thing to others.