Bleeding on probing (BOP) is encountered every day in virtually every dental practice. It is so common that there may be a tendency to undervalue its importance in diagnosing gingivitis and periodontitis. BOP is like periodontitis or pregnancy in the following regards: There is no such thing as “just a little bleeding.” You have it or you don’t. There is no such thing as a little periodontitis; you have it or you don't. There is no such thing as a little pregnant; you are or you are not. You...