Can you treat teeth during breastfeeding? Someone says it's not possib…

Can you treat teeth during breastfeeding? Someone says it's not possible, someone says it's okay without an X-ray and so on, and what was used to relieve toothache before going to the dentist? After childbirth, it expanded but didn't bother me, now I'm lying down and it hurts badly ? I don't know what to drink