It seems that the crack has involved the root also. You should get it treated ASAP otherwise the condition can worsen. For time being take care of the following things:
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Avoid too hot or too cold beverages
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Avoid foods high in sugar or that are very acidic
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Use OTC medications to relive pain and inflammation
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Floss between the teeth that are cracked or broken
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Place cotton dipped in eugenol oil over the cracked tooth
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Sleep with your head elevated
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Do warm saline gargles
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