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And the author of this study, while diving in a shark tank, routinely would notice fallen teeth of the shark that scatter all over the enclosure. And this is dental loss. This is just normal for sharks. Sharks are always losing their teeth, and they're regrowing them all the time. They see their main push in the back and the foreword all the time. So finding them wasn't unusual. But the fellow in this study, he decided to examine the teeth further because he was sort of trying to see a correlation here. So he collected the teeth, the intact teeth, and from, in this case, a black-tipped reef shark. And he went about to see how the teeth would fare under future ocean conditions. First, he and his colleagues took a close look at hundreds of teeth and picked the most pristine. And he wrote down their starting status and then took some high-resolution photographs under a microscope.