I have this idea for children friendly toothpaste (e.g. Low foaming, few chemicals, little mint flavour etc) but where the froth changes colour from blue to white after 2 minutes to indicate when the optimum cleaning time has passed. I am hoping this will give the kids an indicator for when to stop brushing, and hopefully make it slightly more "fun" for them.
I would really appreciate other parents thoughts on this type of product...