Can I get a visa extension in Thailand for dental work recovery?

In the case of dental surgery involving removal, cleaning then 1-3 months for any infection to fully heal. If any bone loss then bone implant and another 3 + months for bone

Yep, it's a medical Visa catered to medical tourists. If they say they can help you then that's great news.

I would consider using an agent. It's not clear that outpatient dental work really qualifies for this extension, but a agent may know how to present it in such a way you get it. I have heard some immigration offices really want you to be an inpatient stuck in a hospital bed to get it and will reject even people in a pretty bad condition as long as they are out of hospital.

Dental work, isn't really "can't travel" which is what the extension is for. You COULD go home after the work, realistically. You can get it by yourself, but you may need to be in a worse state than just getting dental work.

Medical extensions of stays are NOT easily issued. You would need to get the documentation from the dr, the dental clinic etc and go to the immigration office BEFORE your current entry stamp expires and apply for the extension based on medical reasons.

They can be issued for up to longer than 90 days at a time. SO make sure the doctor writes on the request that you can't travel for 90 days OR you're not gonna get the full 90 at once.

People have been known to get medical extensions yes. In fact some places like Bumrungrad do it all for you ie go to immigration and have it all sorted. Medical tourism is important to Thailand and a priority. I was quoted 60k baht per tooth for 4 last week so they are making good money from it 😉

I know some ppl who have had it done at Ivory Dental