as njd said just give a toothbrush to chew on!! you can gently brush them, that way she will get used to been brushed, but dont push it!!
i use a fluoride free toothpaste, but DD is 2.4yrs, i only started with that at around 18 months as she wouldnt let us brush at all!!
once she can spit the paste out she can have normal kids toothpaste