Tooth Plaque and Decay

Hi,

Looking for some advice on my daughters oral hygiene. She is 8yrs old Autistic with PDA. She really struggles with brushing her teeth, she had a wobbly tooth on one side of her mouth and wouldn’t brush that area for months, I have tried every toothpaste, specialist tooth brush, mouthwash and tooth water flossed available to no avail, the plaque is so built up on that side of her mouth I’m worried she will end up in severe pain with tooth decay. I can’t even get her through the doors at the dentist either. 

I’m so worried it keeps me awake some nights as I feel like a terrible parent. Any advice greatly appreciated. Thank you.