N.H. Rev. Stat. Ann. § 189:13

The school board may dismiss any teacher found by them to be immoral, or who has not satisfactorily maintained the competency standards established by the school district, or one who does not conform to regulations prescribed; provided, that no teacher shall be so dismissed before the expiration of the period for which said teacher was engaged without having previously been notified of the cause of such dismissal, nor without having previously been granted a full and fair hearing.