Final answer:
Dry hair and scalp should be treated with products that contain moisturizers and oils. For dryness, using products that contain moisturizers and oils can help to restore moisture and prevent further dryness.
Step-by-step explanation:
Dry hair and scalp should be treated with products that contain moisturizers and oils. Moisturizers modify the rate of water loss, with active ingredients of moisturizers falling into one of two categories: occlusives and humectants. Moisturizers often contain water, which acts as a temporary hydration agent and as a way for the absorption of some components and evaporation of the moisturizer.
Specialty shampoos are also available for different hair and scalp conditions. These include shampoos for dandruff, color-treated hair, and those interested in using organic products. However, for dry hair and scalp, using products that contain moisturizers and oils can help to restore moisture and prevent further dryness.