are you plannning on attending a US dental school as an advanced-standing student? We have 10 advanced standing students in my graduating class and I know a number of schools accept them, mostly for two years but some for 3. If you do that, then you will be just like any other dental student and you will have access to all the profs, dept. chairs, etc for help. If not, then your biggest question should be which schools accept foreign trained dentists in their program. If you are applying to those, then make sure you have a very high NDB part 1 score and a high TOEFEL score, since they might not even interview you if they think you are not fluent in english.
Good luck