It can take up to 12-15 months for complete closure of the gaps and This is normal . But if you are in a hurry you can undergo a surgical procedure (called as PAOO) to accelerate the tooth movement which is done under local anesthesia and is only a minor surgical procedure . You can ask for it if you think it is deemed necessary or wait for another 3-5 months for good finish without any surgical procedure. Consult with your existing orthodontist who will be in a better position to discuss your treatment plan.