When a faucet continues to drip even after you turn the handles completely off, it indicates that the internal waterproof seals have lost their integrity. The most common cause is a worn-out rubber washer, O-ring, or degraded ceramic disc cartridge that fails to form a complete compression barrier against water pressure. Over time, friction and hard water mineral scale erode these internal components, allowing water to bypass the closed valve. Verification: Shut off the water supply under the sink, disassemble the handle, and inspect the internal cartridge or washers for cracks, wear, or flattening.
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