Final answer:
Overlapping relaxer onto previously relaxed hair may result in over-processed and damaged hair.
Step-by-step explanation:
When performing a relaxer retouch, overlapping product onto previously relaxed hair may result in over-processed and damaged hair.
When a relaxer is applied to previously relaxed hair, the chemicals in the relaxer can cause the hair to become weakened and damaged. Overlapping the product onto previously relaxed hair can lead to excessive exposure to the chemical, causing the hair to become over-processed and prone to breakage.
To avoid this, it's important to apply the relaxer only to the new growth at the roots and avoid overlapping onto previously relaxed hair.