Dentist hospital jobs rarely exist, if and any they are usually Pedo, OMFS positions or a mobile or offset clinic delegated by the hospital.
Apply for Nhsc Scholarship, but expect to work at an underserved location for the years you were awarded money
Military Scholarship is similar, because you work for the same years you borrowed and an additional year (Not too sure)
NHSC federal Loan repayment, Indian health, state loan repayment and Joining military post graduation gives you up to $50k a year depending on which one you join,each one has different amounts and they all have different policies.Note some are tax free, some have taxes removed making the money less that expected.
Sign up for Sofi Click here
http://friends.sofi.com/3bmbL (refferal link) .Sign up with Drbank
http://www.drbank.com/student_loan_information.html.to borrow private loans at a lower interest rate than federal is giving now, or to refiance federal loans to private loans at lower interest rates
Find someone to borrow you money at a lower interest rate
Work part time while in school (Not advisable)
I might have missed something, but usually this is the path most people are taking to supress their financial depression.But i can assure you that you sure wont be enjoying the luxury of being a dentist post graduation with heavy debt.