The "best" deodorant is subjective and depends on individual needs and preferences. Consider factors like skin sensitivity, activity level, desired scent, and whether you prefer an antiperspirant or just a deodorant when choosing.

The 3-1-1 rule refers to TSA guidelines for carry-on liquids. It means you can bring liquids, including deodorant, in containers of 3.4 ounces (100 milliliters) or less, all placed in one quart-sized, clear plastic zip-top bag.

Deodorant is generally not recommended for use directly on the vulva or inside the vagina, as it can disrupt the natural pH balance and cause irritation. However, some people use deodorant externally around the groin area to manage odor, but caution and patch testing are advised.

Determining the absolute #1 deodorant brand is difficult due to fluctuating market share and varying data sources. However, brands like Dove, Secret, Old Spice, and Degree are consistently among the top-selling and widely recognized deodorant brands.