I have autism and I am looking for a dentist that is used to dealing with people like me.
Do such things exist?
Yes, they do exist but good luck finding one.
Take a look at this web page:https://www.autism.org.uk/dentist
This page is aimed at dentists but you might find it useful:https://www.autism.org.uk/professionals/health-workers/dentists-info.aspx
My dentist makes no claims to be autism friendly, however, they filed an information sheet (based on information from NAS) I typed in my records. I can post a copy of the sheet if it would help.