Can hair dye permanently kill your hair?

your hair is already dead!! befor you do or apply anything to it!! dyeing it can damage the cudicle of the hair witch makes it less soft and more capable of breaking off and falling out ..bleach is the worst you can apply to the hair oce the cudicle is completly destoryed your hair will have no soft texture, flow of bounce anymore! so you think its dead but its just mutilated! ;)