Yes, obviously, I gave my passport and work permit to my workplace administrative clerk, as in any such situation. That’s the least anyone would expect to do. But my workplace did all the formalities with my documents. No need for me to go to any Thai government office, it turned out.

I worked in Thailand for many years until recently with a repeatedly renewed non-imm B visa, and was concerned about leaving work/Thailand properly so as to preserve the possibility of future visits. I informed my workplace of my intended resignation 30 days in advance, and my workplace did all the exit formalities/cancellations for me to leave work without my needing to go to any immigration office. I secretly wondered if my workplace had actually handled it properly, since I hadn't needed to do, or verify, anything in the process. I then left Thailand and spent some months traveling in India without returning to my native US, and came back from India to Bangkok as a tourist, hoping that coming again like this after my previous non-imm B would be all right. As it turned out, I received a visa-exempt entry for 60 days with no trouble, although I only actually stayed for three weeks before leaving again.

I never traveled to Thailand specifically for dental work, but I lived in the Bangkok area for many years until recently and at various times got dental cleanings at either of the two Mahidol University-linked dental clinics. The one near Victory Monument is a big place, surely one of the biggest such establishments in Thailand; they are friendly and inexpensive (around $30 for a cleaning with plaque removal). The other one is tucked within the hospital across the road from Mahidol University itself. I had checkups and x-rays there and once got an old crown replaced; they did excellent work.

@True *******

Maybe true for you, but not for me. I traveled around a lot, but kept my home base in Bangkok. Always stuff going on for me, so no reason to think there should be anything more needed. I don't waste my money on pointless things.

By my standards, $2600 for one month sounds hugely overpriced. I lived on the edge of Bangkok for more than a decade up to a few months ago, and I seldom if ever spent more than $400 in a month. Admittedly, my penthouse studio was subsidized by my workplace, but even at full rate my studio would probably have been no more than $200, with around $250 for buying food provisions at markets and sometimes eating on the street side. I regularly traveled overseas (US, India, Laos, etc.), which added maybe around $1500-2000 in expenses for the year, but I did not often eat in big time restaurants, nor did I go to bars or clubs because that's not my lifestyle.

With a Non-B visa, opening a bank account should be easily doable. You'll no doubt need your work permit booklet (obtained by your employer from a government office) and of course passport, and an opening deposit. Since you'll be legally making money in Thailand, your employer will presumably need a place to deposit your salary. Find out from your employer which bank they prefer. They should send an employee with you to the desired bank branch and set up an account for you. I worked in Thailand for ten years until recently, and they did that for me.

Maybe, but i kept a scanned copy of the signed form letter I was required to submit stating that I was leaving the job. And my Thai government university workplace took the letter and my passport and work permit book to immigration and later declared to me that it had been handled. As mentioned above, we did this prior to the expiration of my most recent extension, and I left Thailand before the expiration of the extension, without renewing. I might come back someday with the intention of retiring in Thailand for a while, so I guess I'll learn more then.

If the company says to come with them, then do so. In my case, it turned out a bit different, as I was working with an annually renewable non-B visa and then after some years stated my intention to leave one month before my anticipated departure from Thailand. At first the administrative staff said I would need to come with them to the immigration office to cut my extension short (about 1 months before annual renewal), and I filled out a form stating my intention to leave before the end of the contract and gave the staff my passport, but then they took care of it all at the immigration office without my needing to come with them or do anything else. I worried that maybe something had been missed since I didn't personally come to the immigration office, and so maybe they would fine me, but when I came through Thailand six months later as a visa-exempt tourist, they admitted me through immigration with a smile and no issues. But it seems like employees may normally need to come to the immigration office.