Sorry, I must have missed the memo that citizens can only visit dentists of the same ethnicity.
>Dentists who are underrepresented minorities are more likely to serve communities in need and therefore address disparities in dental care.
https://www.nyu.edu/about/news-publications/news/2019/septem...
Once you're qualified, it's natural to go off and place yourself where you can make money.
As an anecdotal example, in my local practice, there are a lot of Eastern-European and now Greek dentists. They're excellent and came here to make more than they would at home (and prop up the NHS whilst they're at it) - I do have a concern that there's likely to be an impact on dental care in their country of origin though. I know precisely that has happened with nursing.
It’s fairly normal for there to be a wide variety of reasons why specific areas are predominantly one or another ethnicity.
Those coming from third-world to first-world are likely much more interested in money than culture, and I can't say for certain but my intuition is that the kinds of ethnic segregation (eg in NY/Chicago, where there's a whole array of little microtowns) that you see in the US are mostly generated by those poorer populations seeking wealth, not cultural value.
I imagine the equivalent American/European expat towns don't exist nearly as strongly/commonly in india/china, as the inverse exists in the US. (of course, you'd also expect less americans/europeans migrating to india/china, since the monetary difference isn't as strong).