Pair of 70's dentist office panels

Nice pair of old illustrated panels from a dental practice; in embossed plastic material, depicting models of teeth affected by two different pathologies: gingivitis and periodontitis. These panels date back to the 70s, the reference law of the year 1972 for the payment of the stamp duty is shown on the left. This is advertising material from Dentosan, reserved for dental and periodontal practices. Dimensions of each: 47 x 33 cm, excellent condition.