Note: Certain classes of patients. i.e. expectant and nursing mothers, children up to the age 16 and children receiving full-time school education, are exempt from denture and dental treatment charges; other persons under age 21 are exempt from dental treatment charges. Children are exempt from charges for spectacle lenses and frames when the latter are in the National Health Service children's range and for lenses where these are supplied in frames from the National Health Service adult range.