Why do humans lose their first set of teeth as children, instead of adolesents or young adults?

What evolutionary reasons do we have for this? Would it not make more sense for teeth to be replaced at an older age, after they have been worn down by years of use?

Why do humans lose their first set of teeth as children, instead of adolesents or young adults?
Our teeth have not caught up with our life expectancy. With humans living on average about 80 years, our teeth were not suppose to last that long. Fortunately our understanding of dentistry has made up for our resilience. In our primitive days, they lasted plenty long enough and there also was use for our wisdom teeth since we had larger jaws.





As far as why we have to lose our first set, think how small your jaw is when you are a child. Your jaw is not large enough for your adult teeth. It would be nice if we could find the gene that controls teeth generation and turn it back on when needed.
Reply:G'day Wintersun,





Thank you for your question.





Deciduous teeth also known as baby teeth are considered to be a marker for permanent teeth and are useful for when the jaw hasn't fully grown. The adult teeth start coming through at six but the final teeth aren't in place until the late teens or early twenties. Also the muscles of the jaw and the formation of the jaw bones depend on the primary teeth in order to maintain the proper space for permanent teeth. The roots of deciduous teeth provide an opening for the permanent teeth to erupt through. These teeth are also needed in the development of a child’s ability to speak and chew their food correctly.





I have attached sources for your reference.





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