Re: root canals?
Just to make it clear from the start, I am not a dentist. The only thing I know is from my own experience. Yes, you are paying for all that sugar! But possibly also teeth clenching/grinding. Chewing gum, even sugarless too much or for too long till it's hard, or eating hard foods, like ice chips, hard pizza crusts, ext. It breaks down the tissue and bone around the teeth. I am an Ice and gum Chewer and I clench my teeth at night. However, it's not uncommon when one tooth needs a root canal for the tooth next to it to need one as well, either at the same time, or soon after. Especially if the dentist was not able(or just didn't) remove all the infection. Infection of any sort spreads. The most likely answer is that the infection was already spreading to the next tooth before your root canal, but the dentist didn't see it. That's not their fault, they can't always see that happening when it's right at the beginning stages.