Yes, laser hair removal can cause regrowth in some cases. While it is not a guarantee that all hair will be permanently removed after treatment, there has been evidence of decreased overall density of the treated area and longer-lasting results than traditional methods such as electrolysis and waxing.
The laser works by targeting the pigment (melanin) in the follicles which heats them up to the point where they can no longer produce hair. However, this does not always happen and certain areas may still see some regrowth depending on factors such as hormones or age.
It is important to talk with your practitioner before undergoing any treatments to ensure you fully understand what might happen based on your specific situation. They will also be able to provide advice about additional treatments or ways to further reduce growth that might occur post-treatment if necessary.