Is the Prophet's saying: "As for the tooth, it is a bone" considered a scientific and medical classification of teeth as bones, or is it a simile or metaphor given the similarities between them, which raises a question about the authenticity of the hadith if it classifies teeth as bones?

In summary, teeth are not bones in the precise anatomical sense. When the Prophet, peace and blessings be upon him, described a tooth as a bone, the intention was that a tooth is like a bone, in that it does not have a sharp enough edge for a good slaughter, and it was not an anatomical statement, or because it becomes impure with blood, thus rendering it unsuitable for purification. This falls under the general category of what is considered bone that the jinn eat. Some فقهاء (jurists) have differentiated between a tooth and a bone in the same jurisprudential ruling. For instance, a tooth has a prescribed compensation (diyah) in the chapter on compensations, whereas a bone does not have a prescribed compensation.