Yes you have to get the retainer made so that the teeth can be kept in the new position but before that you should try to find out cause of gap between front two teeth which is called mid diastema and most common cause is enlarged frenum. In case your case is such then you have to go for frenectomy which is a minor surgical procedure. Without getting the frenum removed, the teeth if moved will again go back to the original position no matter what you do. So finding the cause and treating is right way is more important before closing the gap. So schedule an appointment with your dentist to discuss. For more info on frenectomy you can read the following article from our website to understand better. http://www.identalhub.com/articlecategory-frenectomy-40.aspx