Maybe he just likes the way the brush feels on his lips? My baby girl has had ABA for brushing teeth. I just brush her lips first and then we do the teeth. It took a lot of work to get there but now we brush her lips and teeth.

Instead of a spin brush, try a vibrating toothbrush. That is what my son's OT recommends for him. The spin ones can bother them, while usually the vibrating ones don't. U can usually buy them at Walmart.

How about one of the waterpicks? it would spray the water and get the front of his teeth at least. then you could work your way up.

@WldWestWoman Good call. I will get him one at the Dollar Store and give that a whirl. Thank-You

My son will bite and chew a washcloth on front teeth during his bath. If your son will participate, use a microfiber cloth or a baby wash cloth (available at walmart in a pack of 4 for just one dollar.)