Rachel Bateman, 9, has braces to correct an overbite. Her orthodontist opted not to use expanders to expand her upper arch. Mike Ruocco/NPR hide caption

toggle caption Mike Ruocco/NPR

Using the Icon treatment, Dr. Jin-Ho Phark won't need to drill to fill a cavity. Gretchen Cuda for NPR hide caption

toggle caption Gretchen Cuda for NPR

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