The appearance of theskin, hair and nails can be affected by a variety of factors, including environmental, lifestyle, hormonal and stress-related. Pollution and sun exposure can cause skin damage, while an unbalanced diet and insufficient hydration are detrimental to their health. Smoking and excessive consumption ofalcoholalso contribute to aesthetic problems. In addition, stress and lack of sleep affect cell regeneration, leading to dull skin, brittle hair and weak nails. Changeshormonal, such as those related to menstruation orpregnancy, can also disrupt their appearance.