I go to get my armpits and philtrum hair removed every month.
You can definitely feel the hair getting thinner, and you can expect no hair growth for about a week after the procedure. After that, it will gradually grow back, but when you feel that the hair has grown significantly, it's time for your next visit.
Here's a tip: they recommend shaving before your visit. It'll hurt less if you shave thoroughly before you go.
I don't know if it's because I'm getting used to it little by little the more I do it, or if it's because my hair roots are getting thinner, but as I repeat the rounds, it hurts less and less.
But it's still hot. lol