Pretzels can cause cavities  Interestingly, the longer that a pretzel remains in contact with the teeth when it is being eaten, the greater the likelihood that a cavity will result  What is true of pretzels in this regard is also true of caramels
Ttherefore, since caramels dissolve more quickly in the mouth than pretzels do, eating a caramel is less likely to result in a cavity than eating a pretzel is
treats a correlation that holds within individual categories as thereby holding across categories as well