Every knife used regularly will become dull so purchase an inexpensive knife sharpener and run your knives through it every few uses.They look terrible in my apartment but It's a compromise I have to deal with.
Also, Don't buy dull knives. If you accidentally cut yourself with a dull knife, the wound would be a lot deeper because of the amount of force you have to use to cut an object. So that's why I don't use knives. ¯\_ (ツ)_/¯