Angular cheilitis is a common skin condition that causes inflammation, redness and cracking at the corners of the mouth. It can be caused by wearing old dentures that have lost their proper height. Loss of denture height leads to overclosure of the mouth, which can cause the buildup of moisture and saliva at the corners of the mouth. Factors like saliva accumulation, poorly fitted dentures or excessive lip licking can create a moist environment that contributes to this condition. To prevent angular cheilitis, it is essential to have well-designed dentures and maintain diligent oral hygiene to minimize discomfort. Checking for proper denture height can be a quick, 5-minute appointment.