What is the term for the increase in crosswise curvature throughout the nail plate?

The term that describes the increase in crosswise curvature throughout the nail plate is known as a pincer nail. This condition features a nail that curves inward at the sides toward the center, leading to a pinched appearance. Pincer nails can be congenital (present at birth) or develop later in life due to various factors such as improper nail trimming, trauma, or specific health conditions.

In contrast, onychorrhexis refers to the brittleness and longitudinal ridges in the nail, not the curvature of the nail. Trumpet nails, which exhibit a funnel shape where the free edge of the nail plate is wider than the base, and onycholysis, which is the separation of the nail from the nail bed, also do not pertain to the increase in crosswise curvature. Understanding these terms is important for nail technicians, as they provide insight into the health and condition of the nails, which can affect service offerings and client care.