One of the reasons Shellac can ruin your nails is because it's not very flexible. Because of this, it can cause the nail to bend inwards which can lead to breakage. Not only does this not happen with SNS, the dipping powder also helps to grow and strengthen your nails!

Is Shellac damaging to nails?

Even though Shellac is the safest of all gels, it still has its downfalls. “Any product that is cured onto your nail has the potential of nail damage in the removal process,” Lippmann explains. ... Even if you're not pulling the polish off, Dunne says that hype-frequent Shellac manicures can take a toll on your nails.

Which is worse for your nails gel or Shellac?

Gel manicures definitely last longer, and if you like that plush, ultra-glossy finish, it's the way to go. However, the removal process for Shellac is much gentler on the nails, which makes switching up your colors easier to do. Either way, you will have a manicure that lasts longer than basic polish.