I am no expert, but i believe the more teeth on the scissors the better. I believe the more teeth the less hairs will be cut. The point of the sheers is to cut some of the hairs and not others. a plain scissor has no teeth, so it cuts 100 percent of the hairs in a straight line. the more teeth the more hairs can be spared from being cut, so you will get a more even blend. Debbie can give u better info then me. but this is what i think. could be wrong.