Track pad button not working

Hey, ive just noticed that the corners of my trackpad buttons dont really work, i need to press really hard. I was wondering if any one would tell me why this is, how to fix it. It works fine in the middles but i have gotten quite used to pressing the sides. Any help would be appreciated, is this normal?
thanks

Which corners? Also, it would be nice to know which laptop model you have.

I had the same problem on my old MacBook (white, late 2007). I think it's just a symptom of using the mouse extensively. Sometimes you can make it a little bit better if you pull the button up from the sides, but that's just a temporary fix. Like andr3wkim said though, you didn't give any machine specs, so this might be way off.

Good luck.