We recommended that you should see an orthodontist. In a small percentage of the population, the lower jaw may be longer than the upper jaw (this condition is more prevalent among Asians than Caucasians). This can cause the lower front teeth to protrude ahead of the upper front teeth and. In some cases the correction of a protruding chin may involve braces alone, whilst in more severe cases careful monitoring of jaw growth and tooth development is indicated and these patients will require jaw surgery, together with braces to achieve a good functional and esthetic appearance.