New Jersey Cosmetology and Hairstyling Practice Exam

The standard length of time to keep a chemical relaxer on the hair typically falls within the range of 10 to 20 minutes, but this can vary based on several factors, including the specific hair type and the manufacturer's instructions. Each individual's hair has unique characteristics, such as texture, density, and porosity, which can influence how the hair reacts to the relaxer.

In practice, it’s essential to assess the hair’s condition and follow the specific guidelines provided by the product manufacturer to achieve the desired straightening effect without causing damage. This careful consideration of both the hair’s characteristics and the product instructions is why the chosen time frame is correct. Following these guidelines helps to ensure the relaxer is effective while minimizing the risk of over-processing, which can lead to hair damage. Proper timing can result in optimal results, making this selection the best choice for this question.