Proper hygiene is important for health, appearance, and avoiding sickness. Key hygiene practices include washing hands thoroughly after playing or before eating by singing Happy Birthday twice while lathering with soap; covering your mouth when sneezing or coughing and then washing hands to prevent spreading germs; bathing daily with soap and shampoo to stay clean and smelling fresh; and brushing teeth thoroughly after every meal, including brushing the tongue, to maintain oral hygiene.