Went in hoping to save my tooth. She filled it at the gum line but the tooth is still aching at the root and when pressure is applied. She stuck the needle in at the bottom of the root and left it in for some time. I have never had a dentist leave it in this long. Think maybe there is infection deep inside the tooth or the drilling went to the nerve because the decay was deep? Need some help with this soon because the tooth is hurting. Thanks