YES, IT WILL BE HARD!  I havee seen some Nepalese with dental degree from India going to US dental school again to take remedial courses!   Do you ever wonder why there are not too many dentists in the US from India or Nepal (or from any foreign dental shool) , when there are plenty of foreign medical graduate doctors?  Obviously, getting a license for dental practice is much harder than getting a license for meical practice.

See below:

http://www.ada.org/prof/prac/licensure/us.pdf

http://usdds.blogspot.com/2008/12/dental-license-in-california-for.html

http://www.feedmap.net/blog/foreign-trained-dentists-international-dental-programs-us-license-richmond-virginia/1DD070F88FD69918D3B5FF47826376CB.aspx

http://www.health.state.mn.us/divs/idepc/refugee/ihtf/foreigndocs.pdf