Abstract Nothing could be more desirable than a sparkling white smile. A shining, beautiful smile has been a symbol of health & vitality since the centenary. Discoloration of a tooth is a common esthetic problem caused by either extrinsic or intrinsic factor. The normal color of tooth can be re-established by decolorizing the stain with the powerful oxidizing agent such as 35 percent hydrogen peroxide, which is directly placed on the labial surface of the tooth to be treated. Dental bleaching offers a conservative & simplified approach to change the color of discolored teeth. This case report reflects the remarkable change of tooth color by in-office bleaching.

ABSTRACT C-shaped canals are anatomic variants in root canal morphology. This c-shaped configuration should be diagnosed earliest as it influences the management of such cases more efficiently. They pose challenges in shaping, cleaning and obturating protocols. We require a file system which can contact and shape all possible surfaces of the c-shaped canal. Some of these file systems are XP-endo shaper files (FKG), SAF (ReDent NOVA). For cleaning, advocated systems are XP- endo finisher files (FKG), SAF, ultrasonic files like irrisafe, sonic  files (endo-activator), endo-vac system. 3-D obturation should be done wih downpack and backfill technique (warm vertical or continuous wave of compaction)

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Introduction: When a nonsurgical endodontic treatment is ineffective, surgery is necessary. This entails putting a retrofilling to seal the tooth’s apex. Exposing the lesion, performing a curettage, exposing the root apex, resecting it, preparing the root end, and lastly filling the cavity with the proper material are all steps in endodontic surgery. Thus, the aim of this study is to compare the apical microleakage of four root-end filling materials in cavities prepared using ultrasonic retro tip in in vitro conditions. Materials and Methods: An in vitro study was conducted on 60 extracted single-rooted teeth and was cut at the cementoenamel junction (CEJ). They were biomechanically prepared and obturated. Apical 3 mm root-end resection was done using a diamond disc. Root-end cavities were made using an ultrasonic retro tip. Teeth were separated into four groups and filled with SuperEBA ®️ ethoxy-benzoic acid (EBA; Keystone Industries, New Jersey), mineral trioxide aggregate (MTA), Biodentine (Septodont, France), and TotalFill Bioceramic Root Repair Material (BC RRM; FKG Dentaire Sàrl, Switzerland). The samples were kept in methylene blue dye and split longitudinally. The degree of dye penetration was observed under a stereomicroscope and scored. Finally, the results were analyzed. Results: TotalFill BC RRM and Biodentine showed the least apical microleakage (p <0.05). Group 1 samples had the highest mean microleakage, followed by Group 2, Group 3, and Group 4 samples. Conclusion:All of the sample groups showed some evidence of microleakage, but not all of the samples showed leaking. SuperEBA (Group 1) demonstrated the highest microleakage when compared to the other groups.