Over time the bone will resorb and get smoother where you had the extraction. The procedure, if you feel that your issue is too painful to tolerate, would be to open the gums up, smooth the bone and suture closed. Only if it doesn't get better or you can't tolerate it. It usually gets better and it's not necessary to surgically intervene. Discuss this with your dentist when you start the bridge process.
these are questions you need to ask the dentist who did the extraction. A film should be taken. In an ideal situation, a loose bony fragment should be removed (not difficult--it's already loose) so proper healing can take place and the tissue heals properly. you do not want problems under the bridge.