Final answer:
Using relaxers incorrectly can lead to increased hair porosity, which may result in brittle hair and breakage, rather than improved elasticity, reduced scalp sensitivity, or enhanced shine.
Step-by-step explanation:
When using relaxers incorrectly, one of the potential adverse effects includes a) Increased hair porosity. This means the hair may end up absorbing and releasing moisture more quickly than normal, leading to brittleness and breakage. In contrast, b) Improved hair elasticity, c) Reduced scalp sensitivity, and d) Enhanced hair shine are typically positive outcomes associated with the correct use of hair care products and treatments, and are unlikely to result from misuse. Relaxers need to be applied properly to avoid damaging the hair and scalp. An improper application can lead to various problems, including chemical burns to the scalp, over-processing of the hair, and an overall deterioration of hair condition. Therefore, it is crucial to follow the instructions carefully when using relaxers to avoid these issues.