Endodontic system and instrument for irrigation and disinfection of a tooth root canal

A dental instrument for use with a dental handpiece for cleaning and disinfecting of tooth root canals, the instrument including a shaft and connector for releasable attachment to the handpiece, the shaft comprising:

• a tip end comprising a light-transmissive material;
• a distal portion approximate to the connector;
• and
• a light guide for directing light energy from a light source to the tip end such that the light energy exits the tip end through the light-transmissive material;
• wherein:
• the shaft comprises a longitudinal axis that is an axis of rotation for the shaft;
• and
• the shaft comprises a flexible, compressible and expandable material, such that the shaft is transitionable between a curved shape and a substantially straight shape, wherein the curved shape comprises at least one offset portion in the shaft radially displaced from the axis of rotation.