No, a blocked drain will virtually never clear itself unless the obstruction consists of a minor, water-soluble soap film that dissolves under prolonged heat. If solid physical debris—such as hairballs, grease sludge, food particles, or foreign objects—is trapped inside the P-trap or branch line, the blockage will remain and worsen over time until mechanically removed or plunged. Verification: Test the fixture periodically by running water to check if drainage flow returns to normal.
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