It is not always necessary to make new denture when it is unstable.
Relining consist to add new layer of pink plastic inside the denture to fill the gap left by bone/gums resorption. A gap under the denture is often filled with food and makes the denture unstable creating pain and discomfort to the gums. Prior to relining the denture is cleaned to improve the bonding of the new layer of plastic over the old. The plastic layer is added under the denture evenly to fill the empty spaces. At the same time, the layer of plastic will take the shape your gums and become the new imprint.
The new imprint will therefore allow the denture to match the shape of your gums making it more stable when chewing and improve the retention of the denture in your mouth.