A quick (and totally discreet) way to tell if your deodorant wore off

As summer rolls around, it's pretty normal to walk into a room and get a whiff of B.O. And no matter your level of hygiene, we assure you, not a single soul is completely immune to it. So how do you know if the stench is coming from you or one of your neighbors?

Quickly sniff a cup of coffee. It's the ultimate palate cleanser and resets your olfactory system (which is why you frequently see coffee beans in the fragrance aisle at Sephora).

OK, now (discreetly) give your underarms a sniff. You should know in two seconds whether the offending smell is coming from you or someone else.

RELATED: Deodorant beauty hacks to try

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Deodorant beauty hacks
Apply deodorant to the sides of your feet before slipping on a pair of new shoes. It’ll act as a barrier between your skin and the shoe, keeping blisters at bay.
Have a mosquito bite that’s itching like crazy? A swipe of deodorant will give you instant relief, thanks to the aluminum salts in it.
Here’s a quickie home improvement trick: Rubbing deodorant onto a noisy door hinge stops the squeaking.
Prevent chaffing when you workout by applying a thin layer of deodorant onto any affected areas before you hit the gym.
Little satchels of fresh-cut lavender are nice, but an uncapped stick of scented deodorant can have the same freshening effect in your closet.
One pass down the bottoms of your feet with the deodorant stick will fight off foot odor and wetness. Apply it right before you go to bed, allowing the product to sink in overnight—otherwise you’ll be sliding around in your flats all day.
A swipe of deodorant post-shaving can ease painful razor burn and prevent ingrown hairs.
If you ever run out of remover before your hands are polish-free, thanks to the high alcohol content, a spritz of spray deodorant on a cotton ball makes a nice backup plan.
Spray deodorant has also been known to take care of unsightly marks on smooth surfaces. Spot a pen stain on your wall? Spray some deodorant on it, then wipe it away.
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