Prior to beginning orthodontic treatment I had a 5 mm overjet and a crossbite on one side. My ortho used an expander to correct the crossbite which widened my upper arch. I did not have extractions. I am currently wearing braces and elastics to correct my bite. My overjet has reduced quite a bit, not sure how many mm. At my last appt., my ortho said my treatment is going alot better than he expected
- as you can imagine, I was very happy to hear him say that.
During my initial consultation, he did give me the option of jaw surgery to completely correct my overjet but I told him that I knew I didn't want to have surgery. After reviewing my X-rays, photos and impressions, my ortho felt that with wearing braces and elastics, my overjet will be reduced to about 2 mm. I decided I would be satisfied with this result which is why I proceeded with ortho treatment. I'm thinking my overjet may end up being less than 2mm with the way things are progressing.
I went to 4 consultations and I do suggest you go to a few more evaluations.
Good luck and keep us posted.