Root decay 

Root decay.
Root decay, also known as root cavities or root caries, occurs when a lesion develops on the root surface of a tooth. These lesions typically form near the gum margin and are more common in older adults who are retaining their teeth longer due to increased longevity. Unlike regular cavities, which primarily affect the enamel, root decay affects the softer cementum covering the tooth roots. Here are some important points about root decay:
Causes and Risk Factors:
Periodontal Disease: The primary cause of root decay is periodontal attachment loss. When the gums recede, exposing the tooth roots, they become vulnerable to decay.
Poorly Fitted Removable Partial Dentures: Ill-fitting partial dentures can contribute to gum recession and root decay.
Medications and Dry Mouth: Certain medications and conditions that cause dry mouth can increase the risk of root decay.