As you say that you want to take admission in the MDS course in the USA. Here I am providing List of Entrance Exams which is required for admission in Foreign Universities. These are as follows:

SAT
Medical College Admissions Test or MCAT
GMAT
GRE
IELTS
Test of English as a Foreign Language or TOEFL

Here I am providing you list of some best universities in USA for MDS course. These are as follows:

Harvard University, School of Dental Medicine

University of Maryland at Baltimore (UMB), Baltimore College of Dental Surgery

The University of Texas Health Science Center at San Antonio (UTHSCSA) Dental School

University of North Carolina, School of Dentistry

University of Michigan, School of Dentistry

The University of Toronto, The Faculty of Dentistry

McGill University, Faculty of Dentistry

University of Pennsylvania, School of Dental Medicine (UPenn)

Columbia University, College of Dental Medicine

University of Washington, School of Dentistry