Estimated time for gap closure? Approx 3mm (Photo)

invisalign is the best method to close your space .as it does a remarkable job of doing so without your teeth tipping in the process. dont expect treatment time to be less then 9 months

Looking at the photos provided, I would not recommend upper only treatment. It will negatively effect your bite. Remember, upper and lower arches (jaws) have to work as one unit when biting. You are asking about so called "6 months smile" There is no such a thing as 6 months smile. It is just to lure you into the office. Stay away from those. Invisalign would work for you. Upper and lower only. Estimated treatment time about 6 to 12 months. Make take longer depending on your biting comfort. After the treatment, it is necessary to have upper bonded permanent retainer on the upper front teeth in order to keep the gap closed in the long run. Make sure you find an orthodontic specialist who has good experience with Invisalign treatment and speak to him or her. Good luck 

You have quite a large gap between your front 2 teeth. In order to bring those 2 teeth together, the space either has to be redistributed between 6 or 8 of your front teeth, or else your upper dental arch would have to be narrowed so much that it would affect the way your upper and lower teeth meet each other. If you have your dentist take X-rays and impressions and photos of your teeth, he can then submit all that info to Invisalign and find out what your entire treatment would consist of and how long it would take. You can then decide if Invisalign is the right solution. Obviously, there will be a charge for that service, but you would still have the opportunity to decide if you want to commit to Invisalign or not..