Ключевые слова: adult, background, bad, beautiful, beauty, before, bleach, brownish, care, cheek, clean, close, closeup, color, dental, dentin, dentist, dentistry, dentition, denture, dirty, face, fresh, happiness, health, healthy, hygiene, laugh, lips, man, men, mouth, oral, people, person, problem, protection, smile, stains, teeth, tooth, treat, treatment, treatments, white, whiten, whitening, yellow,