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What is Prevalence of Upper Labial Crease in Women about?

This study examined the prevalence of transverse upper labial creases in 100 female volunteers over 40 years old. The researchers found that 38% of women over 40 had an upper labial crease at rest, and 70% had a crease when smiling or sniffling. Only one third of women were aware they had a crease when smiling. When present, the crease was usually bilateral and located in the mid-philtral area below the nose. Injecting botulinum toxin into the levator labii superioris muscles, which cause a "canine smile,"

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razie_104323295

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