What is a common consequence of using heat on hair without protection?

Using heat on hair without protection typically leads to heat damage. This damage can manifest as dryness, brittleness, and split ends, which occur because high temperatures can break down the hair's natural moisture content and weaken its structural integrity. Without the barrier provided by heat protectants, hair is directly exposed to scorching tools, which can also affect the cuticle—the outer layer of the hair that helps to retain moisture and protect the inner layers.

On the other hand, increased shine, strengthened hair structure, and enhanced curl definition are often seen as positive outcomes of hair care techniques but are not consequences of unprotected heat use. For instance, while using heat can indeed create shine under protective conditions, it is not a direct benefit of unprotected styling. Similarly, heat application alone does not strengthen hair; rather, proper care combined with protection ensures that hair maintains its health and structure.