An apparatus is used to perform disinfection procedures on target tissues within root canal passages and tubules. The apparatus can include an electromagnetic radiation emitting tip having a distal end and a radiation emitting region disposed proximally of the distal end. According to one aspect, the apparatus can include a porous structure that encompasses a region of the tip excluding the radiation emitting region and that is loaded with biologically-active particles, cleaning particles, biologically-active agents, or cleaning agents for delivery from the porous structure onto the target tissues. Another aspect can include provision of the apparatus with an adjustable channel-depth indicator, which encompasses a region of the tip besides the radiation emitting region and which is movable in proximal and distal directions along a surface of the tip to facilitate the provision of depth-of-insertion information to users of the apparatus.
