The link that CrispyQ posted might be a good place to start.
Even though the entries are two or more years old, and the dentists don't really mention Covid on their websites, it seems they did hold onto precautions longer than others did. https://www.covidmeetups.com/
If I can't find someone who takes solid precautions, I'll probably just ask for what I can (N95 masks when the providers are in the room with me), and take the very earliest appointment they offer. (And I'm NOT a morning person.) I haven't yet braved Nextdoor (or, ::shudder::, facebook) but I'll also post to this thread if I find someone.
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