I am suffering from gingivitis

Hey everyone, I am suffering from gingivitis. Initially my gum,s were swollen and had a dusky red. from few months I was having bad breath too. But I didn’t give much importance to it. But now my gums are paining and the gums are too red in color. Last day I went to my dentist and she told me that untreated gingivitis has progressed to gum disease and that has spread to underlying tissue and bone. She told that the only way to get out this is from the root canal therapy from a clinic in Toronto. Is there any other way to get rid of this pain? How many follow-ups are required for the treatment? What kind of crowning will be the best and more durable? Please share your thoughts!