Ключевые слова: ache, aching, adult, agony, background, black, casual, caucasian, dental, dentist, dentistry, disease, expression, face, grimace, gum, having, health, help, hurt, ill, illness, isolated, male, man, mouth, oral, pain, painful, people, person, portrait, problem, sad, suffer, teeth, tooth, toothache, unhappy, white, young,