- As these types of dentures are not attached to the bone, they move when eating, especially the lower dentures, which are easily moved when talking, as it is not possible to achieve a suction effect in the same way as the palate does with the upper dentures.
- This means that when the patient chews on one side, the other side tends to lift up, meaning they must learn to chew on both sides at once.
- A visual limitation resulting from this instability is that with full dentures, the front and upper teeth do not always fit over the front and lower teeth, as normally occurs with real teeth. Instead, the cutting edges tend to be at the same height as the grinding surface of the rest of the teeth, meaning that when there are still natural front and lower teeth, the teeth in the upper denture tend to be shorter than the patient’s original teeth, and as they are concealed beneath the lip, they tend to make them look older than with natural teeth.
- Over time, the bone that supports the dentures changes shape, which means that they can come loose and cause discomfort or ulcers that require them to be adapted by the dentist, and eventually replaced by new dentures.