Folks often refer to a hogs cutters as being “razor sharp” (not true)… but they do normally have a sharp point and a big hog could ruin your day if he got you down. Thankfully, that doesn’t happen often.
Right. Actually, very few animals have razor sharp anything. Some shark teeth come pretty close. I have read that bears, wolves, coyotes, hogs, raccoons, monkeys, opossums, rats, and others that have razor sharp teeth. They don't. About as close as most will come is when the teeth first erupt from the gum and have no wear on them. That is when most are sharpest.
What makes them "razor sharp" isn't the edge, but the power/force/velocity put behind it. A 57 Chevy becomes "razor sharp" if you get it moving fast enough, not that anyone does, but it makes the example.
Many animals have "razor sharp" claws, but when you examine the claws, it is only the points that may be actually sharp (like those of your pet cat). Even the hooves of deer, zebra, and giraffe are often described as being "razor sharp" when they aren't anywhere close. Once again, with enough force, speed etc. behind them, even dull claws can cut quite well, but they probably aren't razor sharp as they don't even have a razor edge.
Along similar lines with razor sharp hog teeth is the expression "they're sharpening their teeth" which is often seen on various hunting forums and on hog hunting TV shows, and often repeated by various hunters. This refers to when a hog, especially one known to be mad or upset, is snapping/popping its jaws/teeth. For some reason, folks have it in their mind that the hog must have had dull teeth before the encounter, and now that he is involved and about to fight or already fighting that he has decided to sharpen his teeth for battle. This is pure nonsense. The jaw/teeth snap/pop is a sign of anger or distress. Many mammals do it and some lizards as well. Bears do it, but you never hear folks exclaim that the bears are sharpening their teeth (because we know they are already razor sharp, LOL). The snap/pop is a warning, of sorts, projected to notify the animals in conflict that the given animal is upset. Some animals do this, growl, stomp feet, bristle the hairs on their back, assume a different posture, etc.
Yes, when the whetters and cutters rub together, some sharpening occurs, but it is extremely minimal and that isn't the reason the animals snap/pop, to sharpen their teeth. The process occurs all the time with jaw use. It is an ongoing process and it needs to be because the teeth are continually being subjected to dulling from contact with foreign materials such as dirt and foods.