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Pain when biting down is often a sign of an underlying dental problem, such as a cavity, cracked tooth, gum disease, a loose filling or crown, or an infection affecting the tooth's nerve. The discomfort occurs because pressure irritates damaged or inflamed tissues inside or around the tooth. Prompt dental care is important, as untreated problems can worsen and lead to severe pain, infection, or even tooth loss. Early diagnosis helps identify the cause and restore your oral health before complications develop.