Planned obsolescence is the common manufacturing practice of designing an item with an artificially limited lifespan. Once the item becomes obsolete (via breaking, becoming dull, or unfashionable) it will need to be replaced, thereby increasing long term sales volume through repeat purchases. You’ll notice this more in the electronics industry with computers and cell phones that become obsolete each year when the next model is released, but grooming tools are not exempt. This manufacturing strategy pushes manufacturers to cut costs and skimp on quality because when items wear out faster, they are replaced quicker, and the manufacturer then reaps multiple profits from the same customer.