I was reminded of this thread this morning when my autistic 9yo was in such a heightened state about going to school that she could not do her teeth or get dressed.
After an hour of taking things slowly, step by step, she let me brush her teeth for 1 minute instead of two in the downstairs loo before we left.
Most days she manages fine on her own, on days like today, it's just too difficult.
I had the luxury of time today to give her space and help her to get ready at her own speed. Most mornings I don't. There have been days when she has gone to bed without brushing or into school without brushing. Not many, but it happens.
No chance am I trying to pin down my already anxious and upset child to brush her teeth. Her nervous system is already completely dysregulated, forcing her, shouting at her, shutting her in the bathroom would be the definition of counter productive.
I have an older child, also autistic, who is what you'd call 'compliant' and if I ask them to do their teeth, get dressed, put their dirty washing in the laundry basket, they just do it.
I always used to laugh at people who'd say "put them on the naughty step" for the same reason. My eldest would have (not that that ever would have needed to), the youngest would have just ran off.