A pair of side cutters work just fine. Do it close to the other teeth to make em even, and it's just like about said, no damage. It doesn't hurt em, but do it quick, cuz they don't like their mouth opened up for all that for long. Dog feed will polish em on off and make em smooth, they'll be jagged when it first happens.
x2. Sure hurts the hog worse than the dog. I would cut them. No k9s around my place if they don't have since enough to use them.