In the inorganic hydroxyapatite matrix of tooth enamel a new stable radiation damage${\rm CO}_{3}^{3}-$ has been found with$g_{\perp}=2.0036$ and$g_{\parallel}=1.9983$. The origin of the H atom centers is bound to the hydroxyapatite OH- ions. Orientation of the microcrystallites as well as the role of water diffusion throughout the enamel structure has been discussed.

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