Can you restart laser hair removal again after you've stopped treatment?

It is not clear why you stopped but yes, you should be able to restart your treatments.  Most people require at least 6 – 12 treatments at regular intervals.  You should schedule a follow-up consultation with a Board Certified Dermatologist. 

Yes, there is absolutely no reason why you cannot start laser hair removal treatments again. It is difficult to estimate how many sessions you will need because everyone is different. Six is the standard number of treatments offered as a package, but some people require less and some require more. Emile N. Brown, MDJohns Hopkins & Harvard Trained Plastic Surgeon

Hi, of course you can start treatment again. As far as how many treatments depends on the areas and person being treated but typically 6-8 sessions is the average. Please make sure to go to a trained professional.