Robert R. Gatewood, D.D.S., M.S., PERIODD.D.S., M.S., PERIODUnclaimed · claim itPeriodonticsHagatna, GU16+ years experienceRegistered with an NPI since 2010. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.(671) 477-2379NPI 1912216128View Profile Claim