There are two major indications for bone grafting following a tooth extraction. First is if there is already missing bone. In that case the site should be grafted to augment the bone and develop the site for implant placement later. The second is if the bone is normal, but implant placement is planned beyond 3 months. In this case site should be grafted to preserve the site. In areas where maxillary sinus is proximity (such as second premolars, first molars- your tooth, and second molars), a site graft can be done regardless to avoid shifting of the sinus floor downward (known as pneumarization).
See below for link on more on this topic.
Without an xray it is hard to evaluate. However if you are not planning an implant within the healing period or soon thereafter you should certainly consider a bone graft. If there is sufficient bone an implant should be placed within a few months following healing of the extraction site, and if there is not enough bone you should wait about 4-6 months following the graft to do the implant. Lastly if there is an infection...do the extraction,and wait till the site closes over safely before doing the graft if needed.