in early 2022, was referred by another asian dental provider, requested they only refer to dental providers "In Insurance Co Network" they did NOT. Joong Hahn failed to remove all infected root pulp, infection returned, complained , but he refused, as My Insurance Co wouldn't pay because Hahn was not in Network, as I requested by my original dentist. Appealed pmt status, Ins Co paid Hahn (Southwest Orthodontics, but, then I received threatening letters demanding payment. Discovered previous complaints online against Dr. Joong Hahn double-dipping, incompetence & injury, & getting paid by Insurance Co & Demanding payment from Patient. Beware. read more