You cannot bring anything that is truly dead back to life. There are steps, however, that can be taken to restore the health of some sick or damaged trees. When the risk of keeping a tree around becomes greater than the benefit of doing so, removal is the best option. If you have a tree that looks dead or dying, it is best to contact a qualified arborist to evaluate the situation. Local Arborist provides Tree Hazard Assessments to determine the likelihood (and possible consequences) of tree failure.