🔬 ScienceGrade 4Lesson 29
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Personal hygiene and safety
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Learning Objectives
- 1Define personal hygiene and explain why it matters for health
- 2Identify good hygiene habits and distinguish them from unsafe habits
- 3Explain how specific hygiene practices prevent illness and injury
- 4Describe safety habits that protect the body from harm
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Mini Lesson
Personal hygiene means keeping your body clean and healthy. Good hygiene habits prevent germs from spreading, reduce the risk of illness, and help your body work well. Safety habits protect you from accidents and injuries.
Why Hygiene Matters
- Germs (bacteria and viruses) live on surfaces, in the air, and on our skin.
- Regular washing removes germs and stops them from entering the body.
- Good hygiene also keeps teeth, skin, and hair healthy.
- Sharing personal items like toothbrushes can spread illness.
Key Hygiene Habits
- Brush teeth at least twice a day to prevent cavities and gum disease.
- Wash hands with soap before eating and after using the toilet.
- Shower or bathe regularly to remove dirt, sweat, and bacteria from the skin.
- Wear clean clothes to reduce bacteria build-up and skin irritation.
- Cover cuts and wounds to prevent infection from entering the body.
- Apply sunscreen when outdoors to protect skin from UV damage.
- Get enough sleep so the body can repair itself and stay strong.
Unsafe Habits to Avoid
- Sharing toothbrushes passes bacteria between people.
- Not washing hands after using the toilet spreads germs to food and surfaces.
- Leaving cuts uncovered allows bacteria to enter and cause infection.
- Eating without washing hands transfers germs from surfaces into the body.
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Tip: wash your hands for at least 20 seconds — about as long as it takes to sing "Happy Birthday" twice.
Vocabulary
hygiene
Practices that keep the body clean and free from disease.
bacteria
Tiny living organisms; some are harmless, but some cause illness.
infection
When harmful bacteria or viruses enter the body and cause illness.
cavity
A hole in a tooth caused by decay from bacteria and sugar.
UV damage
Harm to the skin caused by ultraviolet rays from the sun.
wound
A cut or injury to the skin that breaks the surface.
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