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Written specifically for the dental hygienist, this 6th edition incorporates new knowledge on the concepts of disease, with the most up-to-date information on genetic disturbances, immune responses and injury, and approaches to understanding periodontal diseases. Significant changes have been made in the chapters covering Lyme disease, AIDS, asbestos etc. This fine revision helps the dental health professional keep informed of how disease influences patients' treatment and helps them to fully understand how they can contribute to their patients' health and welfare.