But the good news is that a new poll by Kinder has discovered that most parents are being sensible and not giving their kids sweet treats too often.
The research also discovered that parents are getting confused by all the different advice that comes from the governments, experts and their own doctor and health visitors.
So how exactly should you reward your children? And what other things do you need to notice to stop them being naughty?
We got child expert Dr Elizabeth Kilbey, presenter of BBC's House Of Tiny Tearaways to give us her advice...