The operative cause of the prohibition against slaughtering with a tooth or a nail

Question:
He says: Honorable Shaykh, may Allah grant you success, what is the operative cause of the prohibition against slaughtering with a tooth, a nail, or a bone?

Answer:
The Prophet (peace and blessings be upon him) explained it, saying: “As for the tooth, it is a bone.” He cited the reason for the prohibition because it is a bone, which indicates the prohibition of slaughtering with all bones, whether a tooth or otherwise. As for the back, it is the blade of the Ethiopians—the knives of the Ethiopians—and we are prohibited from imitating the disbelievers. Yes.