As mechanical objects, kitchen drawer hardware can fail for a number of reasons, and there's often a way to fix drawer slides, depending on the problem. Loose screws are fixable by re-tightening them or filling and re-drilling screw holes. Bent hardware is sometimes repairable by removing and resetting the affected parts. Many times, stuck drawer slides only need some lubricant to get them moving like new again.   

Replacing exact duplicates of existing drawer slides is usually a simple task that requires replacing the old one with new pieces in the same location and configuration. Replacing old slides with new models is also relatively easy with patience. However, changing entire cabinet layouts can get tricky and requires some know-how to complete the task.