What type of nails are more flexible than normal and may curve over the free edge?

Eggshell nails are characterized by their increased flexibility compared to normal nails, which can lead to a curving over the free edge. This condition occurs due to a thinner nail plate and may result from various factors, including environmental influences, nutritional deficiencies, or certain medical conditions. It is important to recognize and understand the properties of eggshell nails in a nail technician's practice, as they may require specialized care to manage their fragility and prevent breakage.

Understanding the characteristics of nails can significantly impact the approach a nail technician takes when providing services or advising clients. Recognizing eggshell nails ensures that the technician can suggest appropriate treatments or products that can help reinforce the nails without exacerbating any issues.

The other options describe different nail conditions or characteristics but do not match the description of nails that are flexible and curve over the edge. For example, agnail nails refer to hangnails, Beau's lines signify growth interruptions, and healthy nails possess optimal strength and durability, contrasting with the flexibility of eggshell nails.