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The aesthetic ideal of a mouth with youthful lips—shaped like a lozenge—features an upper lip with a pronounced Cupid's bow, and much fullness to each lip; however, such an ideal physiognomy declines with age, and the lips shrink and lose anatomic definition, as the lips sag, which affects the aesthetics of the smile, by revealing less of the teeth during a relaxed smile.
The human philtrum, bordered by a pair of ridges known as the philtral columns, is also known as the infranasal depression, but has no apparent function. That may be because most higher primates rely more on vision than on smell. [4] Strepsirrhine primates, such as lemurs, still retain the philtrum and the rhinarium, unlike monkeys and apes. [6]
Since 2000, more products and techniques have been developed to make lip augmentation more effective and patient friendly. The relative ease of many injections is due to surgeons using tiny 30 and 31 gauge (about as thick as a dozen human hairs) needles that are used to inject the very sensitive lips.
Small defects of the upper and lower lip can be closed primarily. For the upper lip, defects of up to 1/4 (25%) of the lip may be closed primarily. For the lower lip, defects of up to 1/3 of the lip may be closed primarily. This means the edges of the defect are simply sutured together in three layers: oral mucosa, muscle, and skin.
In contemporary culture, most girls of age 13 to 18 appear to decide whether or not to wear a lip plate. This adornment has caused the Mursi and Surma women to be treated as if they are a tourist attraction. [8] The largest lip plate recorded was in Ethiopia, measuring 59.5 cm (23.4 in) in circumference and 19.5 cm (7.6 in) wide, in 2014.
The more damage the hair sustains, the shorter the lifespan of the artificial hair. Most human hair extensions can be treated as real hair, albeit more gently. *Since human hair extensions are usually heavily processed to achieve uniform color and texture, a mild shampoo is recommended, along with a light conditioner to reduce tangling.