Yesterday you read about bad teeth, and why some people have fillings in their upper jaw, especially in the spaces between their teeth – shown by the blue lines in the picture.
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There is a reason for this: the fact that the upper teeth have wide contact surfaces (the blue lines). The lower teeth have smaller contact surfaces (the blue dots). A toothbrush can usually get through the lower teeth – but not the upper teeth.
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This is why cavities tend to develop between the upper teeth, and if the fillings reach the dental nerve, you end up needing a root canal. Usually followed by a crown. Use an oral irrigator and/or dental floss, and clean your front teeth, as well as all other teeth, from the back!
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