What is a contraindication for chemical hair treatments?

A contraindication for chemical hair treatments is a condition or factor that increases the risk of an adverse reaction or complication during the treatment. Previous allergic reactions or chemical burns fall into this category because they indicate that the client has already experienced sensitivity or damage from chemicals in the past. Therefore, it is critical to avoid chemical treatments on individuals with such histories to prevent further complications or severe reactions.

Dry hair, while needing special consideration during treatments, is not necessarily a contraindication. It may require tailored care but does not exclude the possibility of undergoing chemical treatments altogether. Similarly, an oily scalp or split ends can be managed or addressed with appropriate techniques without posing an immediate health risk during chemical procedures. Hence, prior allergic reactions or chemical burns are the most significant contraindications in this context, underscoring the importance of assessing a client's history before proceeding with chemical treatments.