Which tool is essential for precise hair cutting?

Shears are the essential tool for precise hair cutting because they are specifically designed to create clean lines and accurate layering. The blades of shears allow for the control needed to cut hair at various angles and lengths, making them crucial for achieving professional-looking styles. Their sharp edges enable stylists to make detailed cuts, whether it's for straight cuts or texturizing hair.

Combs are important in the hair cutting process as they help to section and detangle hair, ensuring an even cut; however, they do not perform the actual cutting. Nail clippers are not applicable in hair cutting and do not provide any function in styling hair. A blow dryer is primarily used for drying hair and styling after a cut rather than for the cutting itself. Therefore, shears are the fundamental instrument that hairstylists rely on for precision during the cutting process.