Five signs of infection:
Serious toothache when eating, or when you put pressure on the tooth. Does it hurt when you bite down hard?
Excessively sensitive teeth. Does the sensitive pain linger after the initial contact with hot or cold foods or drinks?
Darkening of your tooth. Has your tooth changed colour? This may be a sign of the nerve dying.
A small bump on the gum, close to the painful tooth.
Tender or swollen gums around the tooth.
Tooth decay is one of the common reasons for root canal infections. You can keep tooth decay at bay by brushing and flossing regularly, chewing sugar-free gum between meals and reducing the amount of fizzy drinks and sugar in your diet.