Which type of nails are characterized as very thin and brittle?

Eggshell nails are characterized as very thin and brittle. This type of nail condition is typically a result of a variety of factors, including nutritional deficiencies, excessive exposure to harsh chemicals, or certain health conditions. The fragility of eggshell nails makes them prone to splitting and breaking easily, which can be frustrating and concerning for those who experience it.

In contrast, corrugated nails have a wavy appearance and are often caused by underlying health issues, but they are not specifically characterized by being thin and brittle. Onyx nails refer to darkened nails, usually as a cosmetic issue rather than a structural one, and healthy nails exhibit strength and resilience. Thus, understanding the characteristics of different nail types helps in identifying nail health and guiding appropriate care or treatment.