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Dentures are old invention and although they were crude in the beginning, people wore them rather than to eat without them. At first they were made from materials from nature but in time we started making them from synthetic materials which made them better. Read more about history of dentures.
Since ancient times we had problems with crooked teeth. They interfered with proper eating and were not too aesthetically pleasing. Because of that, we tried to invent mechanical aids that helped us to fix them. Read about history of orthodontics.
Dental floss has a history that his maybe longer than of the toothbrush but we know for sure that it is in use since the 19th century. It is in the wider use since the invention of synthetic materials like nylon.
History of dentistry is long and ... well - painful. But since the people began using natural ingredients to treat illnesses, they used it for teeth problems also. And slowly but surely, we became more adept in treating tooth decay and other oral problems.