Palate Shapes: The suction of the upper dentures to your gums can be changed by the shape of your palate. Shapes that are square or rounded are preferable to those that are flat or v-shaped. Certain extremes in the palate can also cause additional problems.
Potential Lower Denture Problems: Lower dentures are constantly moving due to the jaw’s mobility and the tendency of the tongue, lips, and cheeks to displace dentures. Also, the lower ridge that connects the denture to the gums is up to four times smaller than the upper ridge, causing the dentures to stick less effectively to the gums.
Some patients will have to alter some of their habitual behaviors to effectively wear lower dentures. When the tongue is rubbed against or under the denture, it may quickly displace. Holding the lower denture in place during the day requires minimizing movement around it.