We have also had on and off problems with toothbrushing. We have always brushed together with DS in his bumbo. After each time he chose to stop brushing we did something new, so we have introduced new toothbrushes, toothpaste and now a finger brush. He seems to be better with that. We reward him after with letting him splash in the sink which he loves. Any reward and personal involvement (like picking her own toothbrush and toothpaste) is good.
I agree though, non-negotiable. My dentist was saying that someone has to give up, the kid or the parent. And that he has seen 3 year olds in the dentist to have teeth pulled. He said the worst part is that most wont let you freeze them, so the parents have to hold them down, and some are wrapped in a blanket.
He did two and wouldn't do it again - it was very traumatic for all involved. I don't know about you, but that motivated me to keep on trying.
He said even if you can only brush with your actual finger, or a wet cloth, do it.
Is she maybe teething and it hurts?
If she hasn't had them brushed for awhile, keep in mind her gums will probably hurt when trying to brush. Kind of like if you don't floss for a long time and then decide to (you know, before our dental appointment
).