If you find that drawer slides are bent, rollers are broken or rollers won’t turn even after lubricating, replacement is the best solution. To keep the project simple, buy new slides that are identical (or almost identical) to the old ones. That way, replacement is an easy matter of unscrewing the old and screwing on the new. Remove a drawer track and a cabinet track and take them shopping with you. Learn how to build an under-cabinet drawer here.
How to DIY it: This job can be messy, so protect nearby surfaces by covering them with plastic or cardboard. Spray the springs with garage door lubricant (about $7 at home centers). Don’t use oil, grease, or other lubricants. They may be cheaper, or you may have them on hand already, but they won’t work as well and tend to pick up dust and grit—just what you don’t want on moving parts.