What should be checked for safety before performing a perm?

Before performing a perm, it is essential to check for hair porosity and elasticity because these factors indicate how well the hair can absorb liquids and how much it can stretch. Hair porosity refers to the hair's ability to retain moisture, which affects how well it can hold the perm solution. High porosity might lead to over-processing and potentially damage the hair, while low porosity may result in the perm not taking properly.

Elasticity is equally important as it assesses the hair's strength and flexibility. Hair that is highly elastic can withstand the chemical and physical manipulations involved in perming without breaking. If the hair lacks elasticity, it may indicate damage or weakness, signaling that the hair may not tolerate the perm process well. Therefore, evaluating these two conditions helps determine if the hair is in a suitable state to undergo perming and ensures the safety and health of the client's hair during the service.

The other considerations, while important in their contexts, do not have the same level of impact on the immediate safety of the perming process as porosity and elasticity do.