"Dont you ever let your nails breathe"
Let's talk about that. Just in case any of you don't know this, your nails are made of built-up keratin and are dead, therefore do not need to "breathe". In fact, one of the best ways to help your nails grow stronger is to keep polish on them. Not only does polish make the nail thicker, since it's like a blanket it also keeps moisture in. Nail polish allows for your nails to remain moisturized longer, making them stronger and healthier.
For those of you that already knew this information I apologize for being repetitive, but for those of you that didn't, I hope I could be helpful!