The dental hygienist's advice...
Ask your kid who is acting up "do you want Mean Mommy to come and visit?"
Make your children speak loudly and clearly.
Don't tolerate whining. Tell them you can't understand whining.
Food always tastes better to your children at someone else's house.
Be consistent.
If they ask for it, make them stick with it, whatever it may be.
Oh, and floss every day.