My daughter is fed by g-tube for medical reasons. She has a sensory processing disorder that results in her being quite orally aversive. This means brushing teeth is a challenge.
I’ve mentioned before that one thing I do that helps is to count to 10 or 20 while I brush her teeth. That way she knows it is coming to an end. I also use a small toothbrush to keep from overwhelming her with sensory input.
Lately I’ve found another big help. I have her brush her own teeth first using this knobby toothbrush you see below. Then I use the little toothbrush that came with it. It works because she has desensitized her mouth by doing her own brushing first. Isn’t that cool?!