N.H. Rev. Stat. Ann. § 415:18-bb

Each insurer that issues or renews any policy of group or blanket accident or health insurance providing benefits for medical or hospital expenses, shall provide to certificate holders of such insurance, who are residents of this state, coverage for medically necessary dental services resulting from an accidental injury to sound natural teeth and gums when the course of treatment for the accidental injury is received or authorized within 3 months of the date of the injury. Treatment made necessary due to injury to the jaw and oral structures other than teeth shall be covered without time limit. Coverage under this section shall be subject to such other terms and conditions of the policy that may apply.