There are some people and some companies that will resharpen and serated knive but it is usually cheaper to buy a new one unless it is a VERY pricey knive. Some blades are designed so that nothing hit the sharpest part of the knife so they don't get dull if used properly. I have a few 40 year old Cutco knives the Double D edge (they don't say serated) that are still very sharp and I used to sell them back in 1972 so I had to hack at wood, leather, tin cans and all sorts of stuff with them. They were pricey then, you probably have to give your first born male child nowadays!