What visa do I need to stay in Thailand for dental work for three months while living in my wife's home?

For a 3 month stay, all you need is a tourist visa

I entered thailand in january with a tourist visa... If you enter with TR visa that gives you 60 days and you can extend + 30 days. You can go and live where you want in Thailand :)

come in visa exempt , then go from there . things are changing every week here .

I dont think you will get entry ay the present time.

Who are qualified?

Applicants should be any of the following:

Thai nationals.

Foreigners who are holding a valid non-immigrant B visa (with Work Permit) and those with the extension of stay of Non-immigrant B visa (with Work Permit), including their spouses and children.

Foreigners who are granted permission (WP3) from the Ministry of Labour to work in Thailand and their families.

Foreigners who are holding non-immigrant D and F visas as part of the diplomatic corps and their families.

Foreigners who are holding non-immigrant O visas who are spouses, parents or children of Thai nationals.

Foreigners who hold Certificate Permanent Residence including their spouses and children.

Foreigners who are students of formal educational institutions approved by Thai authorities, including the parents or guardians of the students.

Foreigners who are in need of medical treatment in Thailand, and their attendants. However, this shall not include medical treatment for COVID–19.

Foreigners who are invited by the government and those who are permitted to enter the Kingdom under a special arrangement including Thailand Elite Visa.

Foreign migrant workers with official documents.

Contact Thai embassy.