My ds, who is 6, already has 6 big teeth. We have been really careful with brushing them with colgate total for 2 minutes twice a day and he uses kids mouthwash 2 times a day too. I have noticed that they look a bit yellow compared to his friends big teeth which worries me a bit. Does anyone know why this may be? He does eat a lot of fruit and is partial to a piece of cake and hot chocolate, but we try to do this at meal times so he doesn't really snack.