procedure for masters in any subject

hi guys,
if anybody could plz help me..................
i am a foreign trained dentist and came to US a few mths back
i am preparing for NBDE part 1, but i plan to do masters in any subject,preferably ortho,endo or pediatrics
i am in california,hav gone thru the main dental nschool sites and their admission req, but cud not exactly figure out what is the procedure for an international dentist to fo for masters in any program

plz guide
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