Full or partial dentures consist of a gum-colored base made of plastic resin, which fits over the remaining alveolar (bone) ridge that formerly held the teeth. The prosthetic teeth projecting from the base are designed to look and function just like your natural teeth. Dentures are held in place primarily by the suctioning effect of their close fit against the alveolar ridges — that's why it's so important that they are fitted properly. The upper denture also gets extra support from the large surface area of the roof of the mouth (palate), which generally makes it extremely stable.At first, wearing dentures may require some getting used to in terms of talking and eating, as the dentures become “balanced” in the space formerly occupied by the teeth. But over time, the muscles, nerves and ligaments of the mouth learn to work in new ways, which allows these functions to occur normally. Dentures also help support the facial skeleton and the soft tissues of the lips and cheeks, which can help create a more youthful appearance.