If you prematurely end laser hair removal treatments, you won't get the desired results. The particular follicle will be dead and won't grow back, but hormonal changes can cause new ones. Allowing too much time between sessions carries the risk of hair moving to the next stage of growth, making it no longer treatable. Most people who undergo laser hair removal should do so every 4 to 6 weeks.
The laser works by targeting the melanin in the hair follicles, when they are in the active growth phase (anagen phase). The laser energy destroys the hair follicle, and if treatment is stopped before all of the hair follicles are destroyed, some may continue to grow. Some follicles won't be able to regrow hair, and others will only be able to grow thinner hair a few months from now. It's important to remember that permanent hair removal requires time and patience; the results vary from person to person and it may take several sessions before achieving the desired results. The results will depend on the density of your hair, the area to be treated, the hair growth cycle and the fidelity with which you carry out your series of treatments. If you decide to skip treatments or wait too long between sessions, you won't get the hair removal you're looking for.
Missing a laser hair removal session will decrease the effectiveness of the treatment. If you miss a session, it's important to get back on schedule right away and try to come back every six weeks in the future. The FDA does not classify laser hair removal as a permanent hair removal method, but many patients still experience permanent hair removal. Even with removal methods that remove all hair and roots, such as waxing, the hair will reappear in a few weeks and, worst of all, you have to wait for it to grow enough to treat it again.