N.H. Rev. Stat. Ann. § 317-A:9

Applicants for a license to practice dentistry or dental hygiene shall pass an examination as determined by the board or have successfully passed a national or regional test approved by the board. Examinations may be oral, clinical, written, or any combination at the discretion of the board and shall be of such character as to test the qualifications of the applicant to practice dentistry or dental hygiene. No license shall be granted to any applicant who shall not pass such examination.