It isonly in a few patients that it is necessary to have teeth extracted for overbite correction. In youngsters and adolescents that are still growing it is usually possible to change the balance between upper and lower jaw growth to reduce overbite. In adults, or older teens, the possible need for extractions is greater since growth has been completed. The need for extraction may also be incresad if in addition to the overbite, there is significant dental crowding.
I suggest you seek the opinion of an orthodontist, and eve nget a second opinion, so you are confident that there is no option other than extraction.