18 U.S.C. § 1821 : US Code - Section 1821: Transportation of dentures

      Whoever transports by mail or otherwise to or within the District
    of Columbia or any Possession of the United States or uses the
    mails or any instrumentality of interstate commerce for the purpose
    of sending or bringing into any State or Territory any set of
    artificial teeth or prosthetic dental appliance or other denture,
    constructed from any cast or impression made by any person other
    than, or without the authorization or prescription of, a person
    licensed to practice dentistry under the laws of the place into
    which such denture is sent or brought, where such laws prohibit;
        (1) the taking of impressions or casts of the human mouth or
      teeth by a person not licensed under such laws to practice
      dentistry;
        (2) the construction or supply of dentures by a person other
      than, or without the authorization or prescription of, a person
      licensed under such laws to practice dentistry; or
        (3) the construction or supply of dentures from impressions or
      casts made by a person not licensed under such laws to practice
      dentistry - 

      Shall be fined under this title or imprisoned not more than one
    year, or both.