Reline materials are used in dental applications to improve the fit and comfort of removable dentures. The oral tissues and bone structure can change, causing dentures to become loose or uncomfortable. Reline materials help adjust the inner surface of the denture, ensuring a better fit and enhancing patient comfort. These materials come in two main types: hard and soft reline materials. Hard relines are made from durable acrylic, offering a long-term solution by providing a firm, stable base that closely adapts to the oral tissues. Soft relines, on the other hand, use a more flexible material that absorbs pressure and reduces sore spots, making them ideal for patients with sensitive gums or irregular tissue conditions.