dental tin

History: 

This item was made by The Dentinol & Pyorrhocide Co in the 1920s. The item was said to help with pyorrhoea and reduce bleeding from your gums. Pyorrhoea is a disease that will make your gums bleed when you brush your teeth and slowly, your gums will be scraped down to the teeth and you may lose teeth from the disease. 

Market & Value:

There is not a large, present market for items like these as you may have to hold onto the item for some time. You can find many ads advertising the product but not to many of the products come around itself. Your item appears to be in decent shape and I'd appraise it at $20.