Utility knives are available with a straight-edge blade or a serrated blade. The serrated blade contains notches that assist to cleanly slice soft-textured foods such as breads, fruits (peaches), vegetables (tomatoes), sandwiches, hard-boiled eggs, pies, and other soft items without damaging the tender contents. Serrated blades will typically require fewer sharpenings than straight-edged blades. However, they do become dull over time, so it is best to hand wash the blade to eliminate harsh detergents from repeatedely hitting against the blade as occurs with knives cleaned in automatic dishwashers.