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Gums are still red and swollen after whitening strips. What should I do?

alli06sti
i tried crest 3d whitening strips 1 hour express and it made my gums very red and swollen and sensitive where it touched the strips. its been 4 days now and no sign of getting better. They are so uncomfortable I can't eat. And I can barely brush and forget flossing. What should I do?

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