<s>[INST] I have sharp, excruciating pain in my lower left side of my mouth from a bad tooth. Its the 2nd one from the back. It has a cavity in it. I had tried various home remedies to be rid of it, and nothing works. My funds are all but nothing, so I am worried a dentist may not help me....What can I do? [/INST] thanks for your query. i have gone through your query. the pain could be because of the infection in the root tip of the tooth. the home remedies will not help. we have to treat the cause by treating the tooth with root canal treatment or extraction. consult your oral physician and get radiograph done and start with the treatment. you can take a course of antibitics and analgesics like penicillin and diclofenac(if you are not allergic). i hope my answer will help you. take care. </s>