SCG4169 - United States 1959 – Dental Health (American Dental Association Centennial) – 4¢This U. S. commemorative stamp was issued in 1959 to mark the centenary of the American Dental Association (18591959). The design features a smiling childs portrait alongside silhouettes of two children at play, symbolizing the benefits of good dental health. Printed in green, the 4 denomination covered standard first class domestic postage of the period. This issue highlights the importance of dental care and public health awareness, making it a