For temporary relief from dental pain, over-the-counter pain relievers can help. Ibuprofen is highly effective for dental pain as it targets inflammation. If you cannot take ibuprofen due to health conditions, paracetamol is a suitable alternative. Please follow the dosage instructions on the package carefully. Keep in mind that these tablets only temporarily mask the discomfort. The decayed tooth and the uncapped root canal tooth need professional attention to address the underlying issues, such as deep decay or potential infection, and to prevent further damage. I highly recommend scheduling an appointment with your dentist soon for a proper evaluation and permanent solution.