Enameled

this must not be confounded with the mark of the tooth, which is entirely different; the mark being the outer, and the cavity the inner hole, and which is found in every young tooth not yet worn down to the kernel, which tooth consists merely of an enameled shell, filled during the life time of the animal with a thickish fluid , which by degrees becomes a grey matter.

In her essays on diary in The Novel of the Future (1968), Nin articulates her case directly, connecting diary and other subjective modes to articulation that moves beyond the "slicker, glossier, the more enameled surface”: “the surface does not contain a key to authentic experience, the truth lies in what we feel and not in what we see" .