very unique c. 1930's vintage medical wall-mount anatomical tooth chart manufactured by lactona inc., st. paul, minnesota. the highly detailed and colorful lithographic print contains multiple illustrations pertaining to the normal tooth and its supporting tissue, environmental causes of dental diseases, restorative dentistry and the effect of the loss of a tooth. found in a far south side dental office. remains in excellent condition, considering age. approximately 30 inches in length.