As new materials and technology have become available, magnetic attachment devices have become increasingly sophisticated, making them a viable option for controlling unfavorable lateral forces in the retention of removable prostheses. Various types of magnetic attachments are now available for a wide range of clinical applications. This text presents the fundamental mechanical and biologic concepts of magnetic attachments and their range of applications; introduces other magnet-related technology; and demonstrates their use in 27 clinical cases, many with long-term results.