How to trim your armpit hair?

I think what you mean is how to do get the skin taught and get rid of the “pit” or “divot”?

I shave my armpits. I reach my arm up and then bend the elbow back down, grabbing it with the same hand, gently pulling it taught.

Recommend using Gillette SkinGuard razor — it’s meant for sensitive skin (which armpits and pubes definitely are).

I’ve read a lot of male porn stars use Gillette Venus, since women’s razors are waaaay ahead in design for shaving these areas. Haven’t tried it but makes sense.
 
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