A cutting tooth system for a disk of a disk-saw felling head. The disk defines a receiving portion and an axis of rotation. The cutting tooth system comprises at least one cutting tooth. The cutting tooth comprises a first portion defining a first protrusion and a second protrusion. The first portion is configured to be received in the receiving portion for rotation with the disk. A second portion defines a chip removal path and a cutting edge adjacent the chip removal path. A first retaining device is configured to couple to the disk to secure the first protrusion in the receiving portion. A second retaining device is configured to couple to the disk to secure the second protrusion in the receiving portion.