Here's why:
* Nail polish is designed to adhere to the nail surface. The ingredients are formulated to create a hard, durable coating that stays on top of the nail.
* The nail polish doesn't penetrate the nail. The nail is a hard, keratinous structure that acts as a barrier. The polish sits on top of this barrier.
* Skin absorption is different. Skin has a different structure than nails. It has pores and other mechanisms for absorption, but nail polish isn't designed to penetrate these.
However, there are some things to consider:
* Some ingredients in nail polish may be absorbed through the skin. While the polish itself doesn't penetrate, certain chemicals might be absorbed through the skin around the nail.
* Nail polish remover can absorb. Acetone, a common ingredient in nail polish remover, can be absorbed through the skin. It's important to use nail polish remover carefully and avoid prolonged contact with the skin.
Overall, while nail polish itself doesn't absorb into the skin, it's important to be aware of the potential absorption of some ingredients and the use of nail polish remover.