Why does my child have tooth pain?

There are many reasons for tooth pain in your child. But the most common cause of tooth pain in children is infection of the tooth due to a tooth decay. An untreated decay can infect the pulp ( Nerves ). When the infection reaches the nerves, your child will have a tooth pain. Your child will complain while eating or during bed-time. Sometimes tooth pain can be associated with swelling in the gums.