Dentures, also known as false teeth, are prosthetic devices constructed to replace missing teeth; the surrounding soft and hard tissues of the oral cavity support them. Conventional dentures are removable. However, there are many different denture designs, some which rely on bonding or clasping onto teeth or dental implants. Immediate dentures are made in advance and can be positioned as soon as the teeth are removed. As a result, the wearer does not have to be without teeth during the healing period. However, bones and gums shrink over time, especially during the healing period following tooth removal. Therefore a disadvantage of immediate dentures compared with conventional dentures is that they require more adjustments to fit properly during the healing process and generally should only be considered a temporary solution until conventional dentures can be made.