T'Mret was a doctor on Starbase 24 in the 24th century. T'Mret repaired the six-year old Worf's brain damage following the Romulan sneak attack on the Klingon colony of Khitomer in 2346. Although the doctor couldn't prevent some memory loss from occurring, Doctor Juanita Tavares saw no reason why Worf couldn't live a normal, healthy life. (TLE novel: The Art of the Impossible)

T'Mret's species and gender were not mentioned. However, the naming structure could indicate that the doctor is possibly Vulcan.
Starbase 24 personnel
UFP seal Peter AbrahamMatthew FalceHilary McKennaT'Mret Starfleet Command logo