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A tooth infection can irritate or damage the nerves inside a tooth, leading to severe throbbing pain that may spread to the jaw, ear, or neck. Common causes include deep cavities, cracked teeth, gum disease, or untreated decay that allows bacteria to reach the tooth pulp. Symptoms may include sensitivity to hot or cold foods, swelling, bad breath, fever, or pain while chewing. Ignoring nerve pain can allow the infection to worsen or spread, making early dental treatment essential for protecting your oral health and relieving discomfort.