Patient Patricia Alvarado of Sparrow's Point, Md., used a Groupon to get a dental cleaning, exam and X-rays.

Patient Patricia Alvarado of Sparrow's Point, Md., used a Groupon to get a dental cleaning, exam and X-rays.

( Kenneth K. Lam / Baltimore Sun )

Patient Patricia Alvarado of Sparrow's Point, Md., used a Groupon to get a dental cleaning, exam and X-rays.

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