Wish this help

Recently I am trying an interesting way for my daughter's (2 and half) eating habit, which works out great but I don't know what I should do next. I made a chart and told her that she will have a star if she can eat her meal well. She will get a dessert after she receives five stars. She likes the star and trying to finish her meals. The problem is that she is getting better and I don't want her to have too much dessert. Your son is older, maybe you tell him he will receive a sticker if he does well on his teethbrushing for one day. After seven days in a row or a month in a row, he will get a reward, dessert or little toy. Wish this will help.