Concrete leveling is a process used to repair uneven or sunken concrete surfaces, such as driveways, sidewalks, and patios. This technique involves lifting the concrete back to its original position, improving safety and aesthetics. The most common methods of concrete leveling include mudjacking and polyurethane foam injection. Mudjacking uses a mixture of cement and soil to fill voids beneath the concrete, while polyurethane foam injection involves injecting a lightweight foam that expands to lift the slab. Both methods are effective and can restore the functionality of concrete surfaces without the need for complete replacement.