Should I have a root canal even though there are no obvious signs of nerve problems with my tooth?

18 months ago my dentist replaced an old filling in my back molar with a crown. The tooth appeared cracked apparently. When I chew any food with substance it still hurts, after many bite adjustments. The gum is sensitive to cold. Xrays show no obvious nerve involvement. Wearing a night guard for teeth clenching has reduced the pain somewhat.

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