The British Dental Health Foundation have produced a series of resources which explain how you need to be a good buddy to your mouth and teeth, how to look after them and what different teeth do.
These are free to download.
Lesson 1 - To know how to look after teeth and to know to use the right amount of fluoride.
Lesson 2 - To know that our bodies change
Lesson 3 - To understand the importance of a balanced diet