Personal hygiene involves maintaining cleanliness and grooming of the external body through regular habits. It includes caring for hair, skin, teeth, ears, hands, nails, and feet. Examples provided are washing hair regularly with shampoo; bathing or showering to prevent body odor; brushing and flossing teeth twice daily to avoid dental problems; washing hands often to prevent spread of germs; trimming and filing nails; and washing feet daily. Maintaining proper personal hygiene is important for health, social interaction, and psychological well-being.