Which technique involves using a comb to temporarily straighten hair?

The technique that involves using a comb to temporarily straighten hair is hair pressing. This method is specifically aimed at smoothing and straightening the hair by applying heat and tension. During hair pressing, a fine-tooth comb is typically used in conjunction with a heated iron to straighten the hair strands effectively. This technique can be performed with either a pressing comb or a flat iron, both of which help achieve a sleek, polished look.

Other techniques listed do not primarily focus on temporary straightening through the application of heat and combing. Backcombing, for instance, is used to create volume and texture by teasing the hair, while blow drying is a method that can help style and dry hair, but does not exclusively focus on straightening. Finger styling involves manipulating the hair with fingers to create various styles and is not associated with the use of a comb or a straightening effect. Understanding these distinctions highlights why hair pressing is the correct answer for this question.