Can't close my mouth, what are my options? 1 year into braces, what can I do to fix this? (photos)

My lips are naturally open and have been even before I got my braces. I've been wearing my braces for a year and the teeth that were protruding the most have been pushed back, however I still can't close my mouth. I don't know if I still have overbite or if my top lip is just too short. Could it be my chin too? My dentist doesn't know what to do and told me I should wait and see. What can I do to solve this problem?