Microtrenching blades with replaceable cutters

A tooth assembly configured for placement about the periphery of a microtrenching blade, the tooth assembly comprising:

• a cartridge having an external surface and an internal cavity defining an internal profile;
• wherein the internal cavity opens to the external surface of the cartridge at a first side;
• and
• wherein the cavity is intersected by a transverse hole extending from a second side of the external surface to an opposed third side of the external surface;
• and
• a tooth comprising:
• a body;
• and
• a projection extending from the body, wherein the projection defines an external profile complementary to the internal profile of the internal cavity of the cartridge, and wherein a transverse hole is formed in the projection;
• wherein the transverse hole of the projection and the transverse hole of the cartridge form a continuous passage when the projection is situated within the internal cavity of the cartridge.