Ключевые слова: age, back, background, blackboard, board, boy, cavity, child, childhood, class, classroom, cropped, day, dentist, dentistry, education, elementary, front, funny, green, greenboard, growth, happy, health, kid, learn, little, male, man, milk, mouth, preteen, primary, pupil, school, schoolboy, september, shirt, small, smart, smile, stomatology, student, study, teeth, toothless, toothy, treatment, white, young,