And just like hemlines, the smiles we covet change with time and trends. "In the early eighties when I first started practicing," remembers Dr. Lowenberg, "people wanted a smile like Farrah Fawcett's. Then, during the supermodel generation, it was Niki Taylor or Claudia Schiffer. Today, everyone wants a wide smile like Julia Roberts or Juliana Marguiles where you see a lot of teeth so it appears much warmer and engaging - the all-American smile."