What would happen?

This box says, do not use if u have: bleached ur hair, etc. Should I do it anyway? Will my hair fall out?

STOOOOOOOOOOOOOOOOOOOOOOOOOOP!!!!!!!!!!!!!!!! The package says what it says for a reason!
The result could be a disaster. Bloopers happen when things seem to go as directed, let alone in this situation. People are so careless and trusting when using all the fancy chemicals on the market. Please don`t
overprocess your hair. You may regret it.

Your hair could turn out a really weird color.... I tried to take my bleached hair back to brown/auburn once and it turned peach. And like the last person said--brittleness and other damage is highly likely.