A mutation where points have grown across the whole tooth rather than just at the ends, creating the appearance of a mouth full of teeth.
Like vampire teeth, the leech will have an over- or underbite, if the teeth notches are not built in a way to slot together evenly.
Saw-toothed leeches are very effective at stripping meat from bones and will happily tear through the carcass of their prey. It is considered undesired trait in most pets and mounts, especially if the individual displays nipping tendencies - careless saw teeth can easily remove a finger or take a bite out of a limb.
Note: the inverse points do not reach the gumline; it is still a single solid plate, like a cookie cutter shark.