Unless your child needs braces for health reasons, it’s okay to opt out. (This is a decision you and your child should make together along with the input of your dentist and orthodontist.)
The process of getting and maintaining braces can be very overwhelming for autistic kids. Your child would have to sit still for many appointments while their dental hardware is installed and adjusted. The daily maintenance, pain, and adjusting to changes within the mouth can be hard, too. Many kids with autism have difficulty with oral hygiene, and traditional braces make it even harder to clean teeth. For all these reasons, autistic people may find it easier to wait until they are adults to get braces.