Torvin

Doctor Torvin was a Trill doctor living on the planet Trill. When Jadzia Dax returned to Trill, in 2371, to find out the cause of her strange hallucinations and she was having major difficulties, Doctor Renhol asked for Doctor Torvin to prepare a new host for surgery. Benjamin Sisko instead recommended to tell the doctor to get himself a cup of raktajino as he wouldn't be needed. 

In 2385, Commander Seifer and Doctor Lox from the USS Phoenix-X (NCC-75948) took the runabout Iroh to Trill in order to seek Torvin's assistance in curing genetic alterations to the Seifer symbiont. Torvin was successful in achieving this, where Lox wasn't. The Seifer symbiont was returned to normal. (: "Remnants")