The Ballet Blog has a very good article on how to relieve--and forever rid yourself of--arch pain in your feet. This is something that I struggle with, and I will be following their advice to help my feet become "retrained" and avoid putting too much strain on my arch.
Read the article here.
Sore feet? Numb toes? (well, mine can go numb after a good pointe workout). Increase circulation in your feet by soaking them in epsom salts (University of Maryland Medical Center says so). It's a great after-class ritual to relax and refresh your feet!