You can take a second opinion. It needs to be re-evaluated clinically and with the x-ray or RVG. However, according to the problem described, textbook definition suggests, a compromised root canal could be done in alternative to the extraction procedure suggested by your primary dentist.
Next Steps
Compromised root canal/extraction based on the outcome evident from X-Ray/RVG
Health Tips
Avoid delaying the issue, and visit nearby dentist ASAP.