Abstract: A treatment instrument can include a fluid platform comprising a chamber and an access port to provide fluid communication between a treatment region of the tooth and the chamber, the chamber having a central axis. The treatment instrument can include a first fluid supply port disposed to direct a fluid stream of a first material into the chamber along a stream axis non-parallel to the central axis. The treatment instrument can include a second supply port distal the first fluid supply port, the second supply port disposed to direct a second material to be entrained with the fluid stream into the chamber.