The formation and development of the face and oral cavity begins in the first branchial arch in the fourth week of intrauterine life. During this process the stomodeum is formed, which is considered the primitive mouth of the embryo.
The formation of the face starts from the five prominences (one frontonasal, two maxillary and two mandibular). The prominences develop giving rise to different regions of the face.
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We share a video with a lot of information about the development and formation of the face and oral cavity (orofacial complex).
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Source: Youtube/ DentalManiaK