Will Hair Grow Back Shorter After Laser Hair Removal?

Laser hair removal permanently effects the hair follicles treated. The laser heats the pigment in the follicle and destroys it, it will never grow hair again. Thicker darker hairs are more sensitive to the laser and will be more easily treated.
Lighter colored, more downy hairs are more difficult to treat. Hair length should not be effected, just the density of the hair. Each treatment session will remove more hair, and you can stop when you have reached the amount of hair with which you are comfortable.

Hair follicles destroyed by the laser will not regrow.. Hair follicles injured by the laser will be finer, lighter and will take longer to grow.

You should expect 75%-90% decrease in the growth of your treated hair, if you're a good candidate for Permanent Hair Removal. Although the remaining hairs will be lighter, thinner, and slower growing, these will grow to full length.
I hope this is helpful for you.