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Forms of cosmetic dentistry existed since the ancient times and since people found out that they can use other materials to replace missing teeth or that they can make them white again. Today it is an important branch of dentistry.
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.
Except with dentures, missing teeth can be replaced with dental implants. People made and used dental implants since some 4000 years ago, using bamboo pegs and seashells instead of missing teeth.