40 years ago, she made a decision not to laugh because she found "a melancholy expression suitable for herself," and had no wrinkles, so she didn't laugh even when her daughter was born.
Christina says it's more effective than any beauty cream and skin care product for a year, and many friends call her Monalisa, who can be happy in a quiet atmosphere.
Department of Dermatology, doctor Velo, says that not laughing is an effective way to fight aging, with actresses doing it to keep young. But psychologist Sears believes that smiling is important to mental health, and the more you laugh, the happier you feel.