Huge concrete stairs can be lifted to their original level. Basement and garage floors can benefit from this process. Curbs, gutters, and whole houses have been raised using this process. Slab jacking has been around for years and people that I have talked to rave about its convenience and success. However, in extreme cases, the slab may sink a bit again.
Some companies offer guarantees against the concrete sinking beyond a certain tolerance.
When seeking a contractor for your slab jacking, look for a company that specializes in this type of work. They need the proper equipment and experience to get the job done right. It is nice to occasionally give a concrete, money saving solution.