Which technique is used to temporarily straighten extremely curly or resistant hair until shampooed?

The technique used to temporarily straighten extremely curly or resistant hair until shampooed is hair pressing. This method involves using a heated styling tool, such as a flat iron or a pressing comb, to apply heat to the hair. The heat alters the structure of the hair temporarily, allowing it to lay flatter and appear straighter. This is particularly effective for managing thick or tightly curled hair textures.

Hair pressing is distinct because it creates a sleek appearance without permanently altering the hair's natural curl pattern, which will revert back once the hair is washed. This makes it ideal for clients seeking a temporary straightening solution.

In contrast, smoothing generally refers to methods aimed at reducing frizz and creating shine rather than focusing specifically on achieving straightness. Curling, as the name suggests, is used to enhance waves and curls, and blow drying can smooth hair but may not provide the straightening effect needed for extremely curly or resistant hair.