What technique is used to achieve a smooth and straight look in a blowout?

The technique that is effective for achieving a smooth and straight look in a blowout is tension styling. This approach involves using a combination of heat and tension applied to the hair during the blow-drying process. By holding the hair taut with a brush or your hands while directing heat from the blow dryer onto it, you can effectively straighten and smooth the cuticle of the hair, resulting in a sleek finish.

Tension styling is particularly beneficial because it allows for control over the hair's texture and volume, helping to eliminate frizz and create a polished appearance. This method is essential in professional blowouts where the goal is to give the hair a luxurious, straight look with a significant shine.

The other techniques do not provide the same level of effectiveness in achieving this specific result. Twisting generally creates curls or waves rather than straightness, combing may aid in detangling but lacks the heat application necessary for straightening, and air drying does not utilize any heat or tension, often leading to a more natural, less polished styling outcome.