Missing teeth can make your cheeks look hollow and your mouth look sunken. More importantly, your diet can suffer. Dentures are artificial replacements for your natural teeth and gums. If an accident, a disease or poor oral health care has left you with only a few healthy teeth or none at all, dentures to replace your missing teeth. There are 2 types of dentures: partial and complete. For both types of dentures, a model of your teeth is made by taking impressions. The models are used to custom-make your dentures.