In June, 2012 a recent paper the teeth of two different species of sharks the first one known as the Shortfin Mako Shark and the second known as the Tiger Shark teeth were studied and a new discovery was made about the anatomy of their teeth. Part of the new discovery was that a geological fluorapatite single crystal were structurally and chemically characterized. It was also discovered these two shark species had the capability within their gums and teeth had a film on these shark's teeth

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... consisted of fluorapatite with a fluoride content. Scanning Electron Microscope (SEM) micrographs further presented and demonstrated evidence that the crystals in enameloid were much harder than both kinds of teeth due to the absence of an organic matrix. Although the 2012 paper presented a remarkable discovery what was not addressed in this paper is exactly where did these shark's capability come from to be able to essentially provide a fluoride emission of fluid that not only protects and hardens these shark's teeth, but also acts as a lubricant on their teeth keeping them in perfect condition for attacking their prey.