I dropped my iPhone 5S and now the touch ID won't work?

So I ended up dropping my iPhone, and the screen would lag pretty bad for the first few minutes. I restarted it and everything seemed fine, but the fingerprint ID wouldn't work. I went to the ID section in settings and my fingerprints were deleted. I tried to click on it, but the letters are grey and it won't let me. I tried to restart my phone again a few days later and it still won't let me add fingerprints. I don't have a warranty so I'm not sure if I should take it in or not? I'd rather try and fix it myself, if there's any way.

You have a one year manufacture warrenty with any iphone. Make an appointment with Apple and bring it into one of there stores. If they won't replace it for you they may either fix it or sell you a new one at a discounted price