Final answer:
To protect parts of the hairstrand not being processed during a relaxer retouch service, a protective cream or oil should be applied. This creates a barrier and prevents damage to the hair and scalp.
Step-by-step explanation:
When performing a relaxer retouch service, it is important to apply a protective cream or oil to the parts of the hairstrand that should not be processed. This helps to prevent damage to the hair and scalp.
One commonly used product for protection is a petroleum-based product such as Vaseline or a protective cream specifically designed for relaxer services. This is applied along the hairline and on any previously relaxed hair to create a barrier and prevent the relaxer from touching those areas.
It is crucial to apply the protectant carefully and neatly to ensure that only the intended parts of the hair are processed during the relaxer retouch service.