Yes, I'd agree that dental treatment in Bangkok is of a high standard.

I've been going to a Bangkok dentist for about 5 years now and I usually pay her a visit whenever I'm there.
I've had a range of treatments from fillings to veneers - all very cheap compared to prices back home.
I've been very happy and when I chipped one of my new fillings, it was replaced free of charge.

You can have dental work done at the private hospitals as well as dental cliinics.