How can I get rid of calluses on my feet?

I am in ballet and I have pointe shoes that I dance in often. Because of this, I have dead skin and calluses on my feet. I also frequently get bruised toenails (which brings with it a lot of pressure on your toe which makes it very hard to dance) that eventually come off and is VERY painful. How can I rid of the calluses and how can I care for bruised toenails to rid of this awful pressure and pain?