According to The Telegraph, a doctor from Japan, Kazue Yamagishi, published a study announcing the invention of a dental toothpaste that could fix a cavity without the need for drilling.
Typically, doctors treat tooth decay by actually removing the "bad" section and filling up the hole. "This is less than ideal because a lot of healthy tooth must be removed to make the fillings stick," reports The Telegraph.
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This new solution could eliminate the need for that entirely. According to Yamagishi's website, tooth enamel behaves differently than skin or bones in that it does not regenerate once it is damaged. This makes conventional dental repair suboptimal as the fillings don't have the same composition or properties as regular healthy teeth, making it even easier to get a cavity in the future. His website states, "The problem is that 60% of dental therapy is said to be a retreatment of the tooth once treated."
Luckily, with his new invention, tooth enamel can be made to regenerate itself.