Yes, it does. Only get fake nails done for REALLY special occasions if your real nails look like crap. My nails were super crappy looking as it got closer to homecoming so my mom let me get fake nails done just for the occasion, but again, they do really damage them. If you do get them, when they're removed, get gel nails done so it can help rebuild your nails' strength.
Yes it does. I used to wear fake nails all the time and finally when I had stopped and decided to grow my real nails out, I realized how bad they were from the various fake nails I used to wear. My nails were chipped. Flimsy. Very easily broken. Now, being a year since I have worn fake nails, my nails are actually coming back into it.