If you combine Alfie Kohn-type parenting with strong willed children, you end up a screaming harridan, like me!
Ok, I am not in a good place with dd and ds right now, with ds just started walking and competing for my attention and dd really ramping up the attention-seeking behaviour.
But the point is sometimes, your children won't do what you want (whether it is brush teeth, or tidy up toys) and short of forcing the child, it will be a huge effort to coax compliance, which will work only once, because the next time, I meet the same wall of resistance with one trick less.
I think more parents should be able to let their dcs be 'disobedient' without feeling like it is an outrage of parental authority or the start of some slippery slope to Belmarsh. You have done the nagging, the child knows what is expected. No action. Leave it.
With a strong willed child, I have to choose my battles. Dd never brushed her teeth until recently when she turned 4. I have given up so long ago she actually asked to 'practice' doing it. And does it practically every morning now without too much fuss. Previously, you would have thought I was asking her to pull out all her teeth and was impervious to reason.
Naturally, there are some battles which you must fight - in my case car seat - cue arms and legs flailing. And that worked too - Dd now tells me and her baby brother to belt up and if I forget to do her straps, reminds me to.
I try to just trust that with modelling the behaviour you want, they will get there eventually. Of course, they may get there faster with forcing and sreaming, but, erm, that is not a solution for every little thing.