Which of the following treatments is primarily used to remove excess bulk from hair?

Texturizing is primarily used to remove excess bulk from hair. This technique involves cutting or thinning the hair in a way that reduces the overall volume while maintaining the hair's shape and style. Texturizing can be achieved through various methods, including using thinning shears or specific cutting techniques that create varied lengths in the hair. This results in a lighter feel and enhances movement within the hairstyle, making it a popular choice for clients with thick or heavy hair.

Layering, on the other hand, involves cutting hair at different lengths to add shape and volume rather than specifically removing bulk. Blow drying is primarily a styling technique that shapes the hair using heat, and conditioning focuses on improving the hair's health and manageability rather than altering its bulkiness. Therefore, while all options have their purposes in hairstyling, texturizing is distinctly recognized for its function in reducing excess bulk.