A few years ago a video, It’s Not about the Nail, went viral. Today it’s been viewed more than 16 million times. In case you haven’t seen it, it's worth the watch! The video shows a husband and wife arguing about a nail in her forehead that is snagging all of her sweaters and causing her headaches.

Margery D. Rosen, author of Seven Secrets of a Happy Marriage, a book based on her Ladies’ Home Journal column, Can this Marriage be Saved? interviewed hundreds of couples whose marriages were in distress and appeared hopeless.“The book is a compilation of columns over the years as well as information from social scientists to help couples have hope,” Rosen says.

If you're married, you've probably had a spirited discussion or two with your spouse. Chances are, it's been about money, sex, jealousy over time spent outside the marriage, in-laws, child rearing or spirituality/faith.“Based on research, we have learned that these are six of the most common toxic subjects for couples,” says Beverly Rodgers, marriage and family therapist and co-author of Soul Healing Love. “These topics cause the greatest amount of conflict in a mar…