New York City—based model Louise Lauritzen, 19, hated her uneven, yucky yellow teeth so much, she rarely smiled. But Manhattan dentist Marc G. Lowenberg put a permanent grin on her face.

Louise's mouth makeover began with a 10-day at-home bleaching treatment that left her lower teeth four shades lighter. (The laminates that would be used to fix her upper teeth made bleaching them unnecessary.) Cost: $350.

Next, Dr. Lowenberg reshaped Louise's lower teeth. This step took 10 minutes and was practically painless. Cost: $200-$500.

Fixing Louise's upper teeth required laminate veneers—opalescent porcelain facades bonded to each tooth to alter its shape, length, and color. Creating and applying the laminates took five hours over two days. Expect to pay $900 to $1,500 per tooth, depending on where you live. To find a dentist near you who does laminates, call the American Dental Association at (800) 621-8099.