I'm not sure why this booklet was among my grandmother Hilda's belongings. Perhaps she went to the exhibit. Perhaps it was handed out at the dentist office. Perhaps a friend gave it to her. My father was barely 3 years old at the time of the exhibit, so perhaps it was her researching the future care of his teeth. A mystery to never be solved.
The booklet was provided by The Iodent Company of Detroit. Printed in USA by Evans Winter Hebb Detroit