Because I'm beginning to think the whole area is nothing more than a money-making exercise. So, I have two boys (6 and 3), and the oldest is very sensitive about flavours, textures, etc. He's always been ok with the Aquafresh Little Teeth toothpaste. Now he's 6, though, I thought it might be important to move him on to the next stage, so I bought him the Big Teeth one. He hated it, so I tried the Colgate brand instead. He hated that too. But then, when I looked closely at the packets, they've all got the same fluoride content (1450PPM) as the Little Teeth one, plus apparently the same other ingredients. And so I then looked at my own adult toothpaste, and it says not suitable for children under 7, so presumably he could use that in a year anyway.
So, my question: is there any difference between the different 'stages' of toothpaste, and is there any reason to move them from one to another, before they get to the right age for an adult fluoride concentration?