It's like you think having a qualification gives you a god given right to a job, regardless of the country you wish to work in.

If America were in need of dentists, if they were inviting people from around the world to apply for vacant dentists jobs, and if white people were getting employed but not black people, then I would accept there is a case for institutional racism.

If a qualified dentist can't get a job in America because America has enough dentists, but he still gets a job as a bus driver, I don't see the problem. If he wants to be a dentist, if he wants to maximise his earnings while using his qualification, choose a better country to go to, ie one that requires qualified dentists.

Maybe he should try the UK. Most of our dentists are foreign.