According to F.D.I formula, the tooth that is denoted by the number 34 is

Each tooth is numbered by the quadrant (1 to 4) and by the tooth within the quadrant (1 to 8) 1 Maxillary right 2 Maxillary left 3 Mandibular left 4 Mandibular right Tooth Numbers Within Each Quadrant: Sta with number 1 at the midline (central incisor) to number 8, third molar so 34 is left lower, 4th tooth (first premolar) Ref - https://en.m.wikipedia.org/wiki/FDI_World_Dental_Federation_notation