Which product is commonly used to smooth out frizz and add shine?

A smoothing serum is specifically designed to reduce frizz and enhance shine in hair. These serums typically contain ingredients that help to soften the hair cuticle, making the hair appear sleeker and more polished. They often include oils or silicones that coat the hair shaft, which not only creates the desired shine but also helps to control frizz by sealing the hair against humidity.

In contrast, a texturizing spray is primarily used to create texture and volume, rather than to directly smooth hair or add shine. Dry shampoo is formulated to absorb excess oil and refresh hair between washes but does not contribute to smoothing or shine. A setting lotion is mainly utilized to provide hold to hairstyles, and while it may help in managing frizz to some extent, it does not specifically target shine or smoothing as its primary function. Therefore, the smoothing serum is the go-to product for achieving the effects of frizz control and added luster.