But according to candidate guide
Additional Eligibility Requirement
[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]Effective 2007, National Board Dental candidates who have not passed an examination after three attempts will be required to wait 12 months after their third attempt before they can apply for reexamination. ..[FONT=Times New Roman,Times New Roman]
[FONT=Times New Roman,Times New Roman]This policy includes any previous examination attempts. An examination attempt is defined as any examination administration where the candidate has been seated at a computer examination facility and electronically agreed to the confidentiality statement to start the examination. After the 12 month waiting period has lapsed, a new cycle of three examination attempts will apply. Candidates are encouraged to seek formal remediation before reexamination. .
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