Personal cleanliness is important for health and hygiene. It includes hand washing, oral hygiene like rinsing after meals to remove food particles, skin care like bathing daily to prevent diseases, and hair care. Proper cleanliness habits also include cutting nails to prevent dirt and germs from getting trapped. Staying unclean can lead to body odor issues and social avoidance, while regular bathing and oral hygiene removes food and keeps skin healthy.