A denture is a removable appliance which is made to replace multiple missing teeth. A complete denture is made when all of the upper or lower teeth have been extracted, while a partial denture is made when some but, not all, teeth have been lost. Dentures are usually made out of acrylic and cast metal and are very versatile devices. For patients who have multiple missing teeth, dentures are often the best and most cost-efficient way to replace their teeth. Dentures must be regularly checked to maintain their proper fit and to ensure that the remaining teeth and the tissues that are covered by the denture remain in good health.