Ключевые слова: aged, background, bad, blue, bristle, brush, bushes, care, change, clean, clear, closeup, compare, comparison, concept, daily, damaged, dental, dentist, dirty, equipment, fiber, germ, head, health, healthcare, healthy, hygiene, intact, isolated, medical, microbe, mouth, new, old, oral, prevention, replace, replacement, shabby, side, tooth, toothbrush, toothbrushes, trash, unhealthy, used, wash, white, worn,