The shape of your nailbed determents if you will need natural or sculpted press on nails.
NATURAL
When you look at your nails and see a very flat C curve from the side to the middle to the other side of your nail, that means you have natural nails and your nailbed shape for press on's is natural. Even though most people have a natural nail C curve they can both wear natural and sculpted press on nails!
SCULPTED
When you have sculpted nails you can see the sides of your nails almost dissapear in your skin because of a very high C curve. This means you will need a sculpted press on nail and wont be able to wear the less sculpted natural press on's. But dont worry, sculpted nails are so so gorgeous!