When all of your permanent teeth need to be extracted from either your upper or lower jaw because of decay, periodontal disease or trauma, complete dentures are created in a dental lab to replace your missing teeth. Over time, dentures can loosen because of the loss of gum tissue and jawbone that deteriorate when they no longer have tooth roots to keep them stimulated. This can result in the use of dental products to keep them adhered to your gums. Your dentures are easily removable for cleaning.