If asbestos-containing material is in its original situ, doing the job that it was intended for, and remains in good condition, then often the best course of action is to leave it in situ and manage and maintain its condition. The most significant danger of asbestos fibres is by inhalation, which can lead to health problems such as mesothelioma, asbestosis, and lung cancer. This is why it is critically important that if asbestos is to be removed, it is removed only by trained professionals.