How do I persuade 18m old to let me brush her teeth?

[Witchycat]

She has never liked having her teeth brushed. Screams & cries when I try.
I've tried leaving it a day or two & being really minimal about it to see if that would get her to dislike it less & then I think I can't just carry on doing that so I have to go back to holding her tight so she can't get her arms/hands in the way & she hates it.

Any advice?

sorry i didnt mean to intervine....

I sing "The toothy brush goes round and round/flick flick flick, scrub scrub scrub/ to the Wheels on the bus tune with Ds since about 16 months when he started refusing.

He loves it and has just started spitting into the bowl too, which is also an added fun bonus for him. (I had to virtually sit on him a few times previous!)