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O onychodermal band is the “natural smile line” of the unidade de pregos, where epitélio do leito ungueal bunches up to pass through  the tight seal of the hiponíquio creating a grey line at the edge of the leito ungueal before the borda livre do placa ungueal.

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What is the onychodermal band?

The onychodermal band is an area at the edge of the nail bed that looks slightly grey when seen through the nail plate. It is considered to be the ‘natural smile line’. There is a strong seal under the free edge that prevents alergênicos e patógenos from reaching the delicate nail bed where they can cause infections that will affect the nail and the matriz (where the nail is created). The skin from the nail bed, as it grows forwards, squeezes past this seal and slightly bunches up. This is why it appears to be a slightly different colour

Is having a natural smile line healthy?

Every nail has a natural smile line. It is where the nail grows away from the skin of the nail bed.

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