THANKS TO THESE EXPERTS:

Lashaun Dale, vice president of Group X Creative at 24 Hour Fitness USA, Inc.; Phil Reed, senior consumer advice editor at Edmunds.com; Joshua Zeichner, M.D., director of cosmetic and clinical research in the department of dermatology at Mount Sinai Hospital, in New York City; American Dental Association; Walter Kaye, M.D., research adviser for the National Eating Disorders Association and director of the Eating Disorder Treatment and Research Program at the University of California, San Diego, School of Medicine; Tom Spalding, director of marketing and communications at the Chimney Safety Institute of America; Steven Weisbart, Ph.D., senior vice president and chief economist at the Insurance Information Institute; Jodi R. R. Smith, president of Mannersmith, an etiquette consulting firm in Boston and author of From Clueless to Class Act: Manners for the Modern Man/Woman; Patricia Rossi, business etiquette consultant and author of Everyday Etiquette.

SPECIAL THANKS TO:

Kiley Bense, Andra Chantim, Allison Chesky, Tanya Christian, Rachel Christensen, Danielle Claro, Sarah Copeland, Julia Edelstein, Didi Gluck, Betsy Goldberg, Marla Hassner, Lindsay Hunt, Jenny Jin, Dave Kanter, Charlyne Mattox, Chelsea Renaud, Liz Welch.