What causes half-sided headaches triggered by toothache?

Half of the headaches caused by toothache may be due to dental diseases, trigeminal neuralgia, etc. When toothache and headache occur simultaneously, it is highly likely to be caused by a dental problem, commonly associated with dental nerve leakage. Such patients often have cavities on their teeth, and as tooth decay progresses and penetrates into the pulp chamber, the tooth pain persists. This occurs because the nerves in the teeth are connected to the trigeminal nerve in the face.