Complete dentures are replacement teeth for when all your natural teeth have been removed. It comes in two types. You can wear immediate complete dentures for a couple of months while you wait for your gum tissue to heal. After that, you can get conventional complete dentures. A complete denture is a removable appliance used when all teeth within a jaw have been lost and need to be prosthetically replaced. In contrast to a partial denture, a complete denture is constructed when there are no more teeth left in an arch, hence it is an exclusively tissue-supported prosthesis.