I'm a dual UK/US citizen and thought about establish residency in the UK for a year then applying to UK dental schools to get resident (cheaper) tuition. The issue with UK schools is they offer dentistry as a 5 year Bachelors of Dental Surgery (BDS) aka, not a graduate degree. In the UK you come straight out of school at 18 and then graduate at 23 as a dentist as opposed to the US version of 4 years undergrad and 4 years of dental school. The issue is, if you try to come back to the US to practice then you will have to go to a 2 year international conversion program. In this 2 year program you basically repeat years 3+4 of dental school in order to be awarded a dental degree that will allow to practice in the states. I think though, there are a few states in the South like Texas, Florida, Virginia that if you want to practice there do not require you to do the 2 year conversion program. If you get a UK degree you're better off staying in the UK/rest of Europe that follows the BDS model, or the Middle East (rich ME countries want to increase medical tourism). In conclusion: probably not worth it if you want to come back to the US.