What would you do in this dental situation?

One side of my lower teeth has been aching for a week. I can’t really pinpoint which tooth it is. I went to the dentist on Tuesday and the nice, new dentist said the X-rays didn’t show what it was and since I couldn’t isolate the ache, she gave me some actions to take. One was to go to an endodontist to find it and the other was to take an antibiotic for a week and see if it went away. She also suggested an Nsaid. So far I’ve been taking ibuprofen some but I haven’t taken the antibiotics because that seems like an odd idea to me. I’m trying to find the tooth.

TLDR – Endodontist, back to dentist or take the antibiotics?