Healthy Skin, Hair, and Nails Test Review Sebaceous glandsRetinaIrisLensPupilAstigmatismHalitosisMelanomaMelaninEpidermisDermisHair FolliclesPlaquePeriodontal diseaseMalocclusionPeriodontiumCorneaSclera- Pigment in the skin is called_______________. Name five common skin problems. Name the three main functions of the skin. List the two main layers of skin. Identify five tips that will keep your skin healthy. List four characteristics one should look for when checking moles for early detection of melanoma. (ABCD) Identify two potential hair problems. Name two personal care techniques that will keep your nails healthy. Identify the three main parts of a tooth. Describe how bacteria causes tooth decay. List four steps you can take to keep your teeth and gums strong and healthy. Why is it important to have healthy teeth?