Dandruff is very common, and is simply the sloughing off of skin cells from the scalp in scaly clusters.
Heat, chemicals and a poor diet may all cause hair damage and hair loss. It may also be a symptom of some health problems, or an adverse effect of some medicines.
Hair loss can be permanent or temporary and affects most people at some stage of life, usually as they get older. When it occurs at a younger age or is severe, it is sometimes quite distressing.
Factors that can cause unhealthy or unsightly nails include poor hygiene, infections, trauma, underlying health problems, and poor nutritional status.