It depends on the severity of scoliosis. Shoe lift helps in some cases. There are several factors that contribute to scoliosis. Leg length discrepancy is the only factor. It is the curve of the spine that decides whether we should add heel lift or not. You can check out this article for more info regarding this. I would also suggest you do some stretching exercises, as it is the most suitable non-surgical way to treat scoliosis.