| http://www.w3.org/ns/prov#value | - Accordingly, in accordance with the present invention, the color or other optical characteristics of a sub-surface structure, such as DEJ 542 of a tooth, may be assessed or quantified in a manner that is in general independent of the optical characteristics of the surface of the tooth, and do so non-invasively, and do so in a manner that may also assess the thickness of the outer layer, such as en
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