How do you stop armpit hair from growing so fast?

Apply a layer of shaving cream or soap.
  1. You can also try using a little bit of hair conditioner instead of shaving cream or soap. This works just as well.
  2. The less hair you have on your underarms already, the more cream, soap, or conditioner you’ll want to apply to protect your skin.

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Why does my underarm hair grow back so fast after shaving?

The answer is simple. The reason hair appears to grow back quicker when you shave, whether that’s on your face, legs, underarms etc, is because the hair is cut close to the surface of the skin. Meaning it grows straight from the surface, making it visible almost instantaneously.