ABOUT THIS BOOKUnit 1 Personal HygieneLesson 1 Taking Care of Your Skin, Hair and NailsLesson 2 Dental HygieneLesson 3 Hygiene at Home and at SchoolUnit ReviewUnit 2 Infectious DiseasesLesson 4 Understanding DiseasesLesson 5 Stopping Infections Before They StartLesson 6 Preventing Other Infectious DiseasesUnit ReviewUnit 3 Sexually Transmitted Diseases and AIDSLesson 7 Sexually Transmitted DiseasesLesson 8 AIDS and HIVLesson 9 Prevention of Sexually Transmitted DiseasesUnit ReviewProjects Project 1 Personal Hygiene Check-ListProject 2 The Common Cold and the FluAnswer Key