When can you introduce sugar and chocolate to your kids diet?

Dear mummy Cathy, If possible, try to drag as long as you can by not introducing sugary stuff. Once started, will hard to stop the addiction for some kids. For my number 1, I try not to give her sweets before 4 years old. We kept telling her it will be bad for her teeth and encourage her to brush her teeth regularly. Also school play a part, our kids childcare totally do not allow goodies bag or sweet stuff in their diet and it really help us a lot when we are educating our kid. But when you have no 2 kid, it will be more challenging. They will see their gor gor or jie jie eating the sweet, they will request for it too. ..you can imagine the rest of the story