Which section of the hair shaft is often damaged by improper extension techniques?

The cuticle is the outermost layer of the hair shaft and plays a crucial role in protecting the inner layers of the hair, including the cortex and medulla. This layer consists of overlapping scales that are tightly packed together. When extensions are applied using improper techniques, excessive tension, or harsh materials, the cuticle can become damaged, leading to frizz, split ends, and overall deterioration of the hair's health and appearance. Maintaining the integrity of the cuticle is essential for the longevity and aesthetics of both natural hair and extensions. Damage to this layer can compromise the hair's protective barrier, making it more vulnerable to environmental stressors and further damage.