42 C.F.R. § 31.16
(c) Dental treatment shall be furnished to the extent of available facilities only at medical relief stations where full-time dental officers are on duty; at other medical relief stations the dental treatment shall be limited to emergency measures necessary to relieve pain.
(Sec. 610(b), 58 Stat. 714, as amended; 33 U.S.C. 763c)