Things like stress, hormonal changes, new medications, and different lifestyle factors (like harder workouts or shifts in the weather) can all impact how you sweat, and your go-to deodorant may not be able to stand up to the new situation.

Can your body become immune to deodorant?

You Can Become Immune to Your Deodorant

The body may adapt and find a way to unplug the glands, or simply produce more sweat in the body's other glands, so it's a good idea to switch up your deodorant products every six months or so.

Why do armpits smell even with deodorant?

Deodorants stop sweat from smelling but don't stop sweat itself. These products are often alcohol-based, turning your skin acidic. This inhibits bacteria from forming — which is what causes sweat to smell. If OTC deodorants aren't effective, talk to your doctor about prescription-strength deodorant.