What is a common tool used to cut hair extensions?

Hair shears or scissors are commonly used to cut hair extensions due to their precise cutting capabilities. The sharp blades of shears or scissors allow for a clean cut, which is crucial for blending extensions with natural hair. This ensures that the extensions look seamless and natural, an important factor in achieving a professional appearance.

Electric razors, while they can be used for certain styles, may not provide the precision needed for cutting extensions. Thinning shears serve a specific purpose of reducing bulk and texturizing hair rather than making clean cuts. A comb is primarily a styling tool used for detangling and sectioning hair, not for cutting. Thus, the use of shears or scissors is integral in the extension application process for achieving the desired hairstyle.