The blood clot after tooth extraction usually does not fall off naturally, the reason why some people say it will “fall off” is that the blood clot is not visible in the extraction wound after some time, but it is not really falling off, the blood clot will continue to change over time and evolve into other tissue structures. Under normal circumstances, a blood clot can be formed in the extraction wound in about 15-30 minutes, which can play a role in protecting the wound, preventing infection and promoting normal healing of the wound. The clot then undergoes mechanization and forms granulation tissue and fibrous connective tissue, a process that takes about 20 days. Subsequently, after about 38 days, 2/3 of the extraction socket is filled with fibrous-like bone and the fibrous connective tissue is replaced by the original fibrous-like bone tissue. immature bone tissue is completely formed after 3 months, and bone tissue is reconstructed and eventually normal bone tissue is formed in 3-6 months. Therefore, no brushing or rinsing of the teeth and no suctioning of the extraction socket for 24 hours after extraction protects the blood clot, which in turn facilitates the healing of the wound.