What is one effect of overprocessing hair with a relaxer?

When hair is overprocessed with a relaxer, it undergoes excessive chemical treatment that alters its molecular structure. This process can lead to significant damage to the hair's cuticle and cortex, compromising its integrity. As a result, the hair becomes weak and prone to breakage. Overprocessing often strips the hair of its natural moisture and protective oils, leading to dryness and brittleness, which further contributes to breakage. This is why damage and breakage is the correct answer, as it directly relates to the detrimental effects of using relaxers too frequently or inappropriately. The other options, such as increased elasticity, improvement in hair strength, or enhanced shine, are typically associated with healthy hair, rather than hair that has been compromised by overprocessing.