Two things are necessary for odor care: "sweat control" and "odor-causing bacteria control."
In other words, to combat underarm odor, you need two things: "managing sweat" and "preventing the growth of odor-causing bacteria."
Saji: "First, let's talk about clothing choices. Since excessive sweating can easily cause body odor, it's best to choose clothes that don't make you sweat easily, such as not wearing too many layers and wearing loose-fitting, breathable clothing. If you wear tight-fitting clothes like knitwear, use sweat pads to absorb the sweat."
It's also important to remove sweat and odor-causing bacteria before going out by taking a shower or wiping your armpits with a sweat-wiping sheet.
Saji: "The important thing to remember is not to leave your armpits wet. If moisture remains, bacteria can easily multiply. Since the armpits are often closed, the moisture doesn't evaporate easily, and if this happens, it will have the opposite effect of what you thought would be a clean solution."
Furthermore, it's effective to wipe away underarm sweat frequently, such as when you go to the restroom. If you remove unwanted hair beforehand, it's easier to wipe your underarms, and it's said to further suppress the growth of odor-causing bacteria.