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What is Nasmyth's membrane?

  1. A tissue layer covering the gums

  2. A tissue layer covering the tooth surface

  3. A protective layer of the jawbone

  4. A layer of enamel on the teeth

The correct answer is: A tissue layer covering the tooth surface

Nasmyth's membrane refers to a thin layer of epithelial tissue that covers the surface of a newly formed tooth. This membrane is composed of remnants of the enamel organ, which plays a crucial role in tooth development. Nasmyth's membrane protects the delicate enamel layer immediately after eruption, helping to prevent microbial invasion and ensuring the integrity of the tooth's enamel before it fully mineralizes. Over time, this membrane can wear away or be removed through normal oral hygiene practices. The other choices do not accurately describe Nasmyth's membrane. A tissue layer covering the gums pertains to gingival tissue, while a protective layer of the jawbone involves the periosteum or other connective tissues surrounding the bone, and a layer of enamel refers specifically to the hard outer surface of the tooth itself, which is distinct from Nasmyth's membrane.