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Excessive heat during chemical treatments can lead to significant damage to the hair structure. Hair is made up of proteins, primarily keratin, and when subjected to high temperatures beyond what it can tolerate, the proteins can break down. This results in changes to the hair’s elasticity, moisture retention, and overall integrity.

Damage may manifest as brittleness, dryness, and split ends, leaving the hair looking lifeless and unhealthy. Over time, such damage can also result in irreversible changes, making it essential for professionals to monitor temperatures closely and use protective measures during treatments to maintain the hair's health.

Improved hair texture, enhanced color vibrancy, and increased curl retention, while desirable outcomes of some hair treatments, typically rely on correct application processes, not excessive heat. Thus, too much heat undermines these goals, leading to compromised hair health rather than improvements.