Background: Use of the smokeless tobacco is a major public health problem. Oral mucosal hyper keratinization occurs due to smokeless form of tobacco. Objective: To determine the Submandibular Gland injuries induced by smokeless tobacco in Albino Rat. Study Design: Experimental study.

Objective: The goal of this study was to document the Root Canal morphology of the first mandibular premolars using radiography. Materials and Methods: The trial took place at the LUMHS Operative Dentistry Department. Two hundred removed permanent mandibular first premolars that met all of the study's inclusion criteria were gathered from LUMHS Jamshoro/Hyderabad and nearby private dental clinics in Hyderabad. All debris, soft tissues, and calculus were removed from the teeth, which were then preserved in a 10% formalin solution. Each tooth's length was measured from the crown's tip to the root's apex. An removed tooth, on the other hand, was examined from all angles, including buccal, lingual, and proximal. Root concavities and grooves, as well as bifurcation and apical curvature, were found. Results: Comparison between both views showed 189 teeth have 1 root in and 186 have 1 canal in buccolingual view, while 182 teeth have 1 root and 179 have 1 canal in mesiodistal view. 11 teeth on buccolingual and 18 teeth on mesiodistal view showed 2 roots and 14 teeth on buccolingual and 21 teeth on mesiodistal view showed 2 canals. 110 teetj showed type I canal pattern. Conclusion: It is concluded that mandibular first premolar teeth have a wide range of radicular traits, with the majority of them having one root and one canal.