My brother always buys my kids sweets when they visit on a saturday and Dd2 asked for Polos. I told her she couldn't have them as eating the whole packet would give her a poorly tummy (not sure if that is correct).
Anyway she insisted whatever he brought had to be white and minty (no choccie areos etc).
Should i have allowed a whole packet of polos then or not ??
Don't ever let them have ordinary mints, nutty - with sugar in - get the sugar-free ones. I ruined my teeth with Polos when I was a teenager, the dentist said they are one of the worst sweets for tooth decay.
Apart from that I don't think mints are particularly bad - I guess you could get tictacs or something if you don't want them to have such a large quantity?
Oh, I'm exactly the same (I think we all turn into our mothers in the end) - DS2 is 11 and I've only let him have it quite recently, mostly because he takes it out of his mouth half-chewed and I don't know where he puts it, ugh. I'm sure your DD is more ladylike with hers