Concept:Needle teeth are sharp temporary teeth in newborn piglets that must be removed for safe management.Explanation:Needle teeth are the sharp canine teeth of piglets.They can injure the sow's udder while the piglets nurse.They may also wound littermates during competition for teats.Clipping or removing these teeth is a standard practice in piglet management.This helps protect both the mother and the young piglets.Answer:D. piglets