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  1. Hygiene - Wikipedia

  2. About Hygiene | Water, Sanitation, and Environmentally Related Hygiene

  3. Why is personal hygiene important? - Medical News Today

  4. Hygiene | Facts & Definition | Britannica

  5. Hygiene - UNICEF

  6. HYGIENE | English meaning - Cambridge Dictionary

  7. Hygiene Definition & Meaning - Merriam-Webster

  8. HYGIENE definition and meaning | Collins English Dictionary

  9. HYGIENE | definition in the Cambridge English Dictionary

  10. Hygiene: What and why? - PMC - PubMed Central (PMC)