Something to Gnaw On

People are always complaining about toddler's sleep habits, the hard time potty training, the tantrums ... and while a) we haven't had many problems with sleeping except the occasional climbing-into-momma's-bed-at-2:30am and the even more occasional no-nap-on-the-weekend and b) we haven't attempted potty training yet (yikes) and c) tantrums ... no one can prepare you for tantrums --- HOWEVER, why does no one complain or give advice on how to get your child to rinse their mouth out after brushing their teeth?

I can't see that it's possible that I'm the only one having this problem. The Boy (as he's generally known on Facebook, and therefore may as well carry on over here) has no problem brushing his teeth. However, he cannot understand the art of spitting out the toothpaste. I've tried to teach him, to show him - to do it myself and to pour the water in his mouth for him so he can let it dribble out. No go. We switched from baby toothpaste to toddler toothpaste with fluoride, but we then had to switch back because he was swallowing the toothpaste again (an aside: why do they make toddler toothpaste taste like bubblegum? Maybe if it didn't taste like CANDY it might be easier to get them to spit it out???)

He's 30 months old. Do you have any suggestions? How old was your kid when they switched to fluoride toothpaste?