Should I replace my iPhone 5s screen?

I cracked my screen and a small piece fell off and my dad says if I don't replace it stuff can get into it and wreck my phone completely so should I replace it?

Yes it can. Dust will and water has a chance to if left hanging around also someone could knock it and damage to the lcd screen could occur.

Replace it, but not with Apple. Like all their stuff, their repairs are horribly overpriced. Look around on the internet and see if there's somebody you can send it to to get fixed.

Yh you should replace it