Table 2.

Questions composing the preventive diet index (PDI) and the cariogenic diet index (CDI) [33].

Cariogenic Diet Index (CDI)	Preventive Diet Index (PDI)
Content of the question
How often do you consume fruits?	How often do you consume sticky products such as toffee-type sweets, fudge, cookies, crackers, crisps?
How often do you consume vegetables?	How often do you consume acidic products such as citrus fruits, lemon, vinegar, pickled vegetables, pickled vegetables, vinaigrette-type sauces?
How often do you consume fibre-rich foods such as whole-grain bread, bran, mountain cereal, groats, whole-grain pasta, raw fruit or vegetable salads?	How often do you consume sweets such as candies, cakes, pastries, chocolate bars, muesli bars, other confectionery?
How often do you consume dairy products (milk and its derivatives, cheese, natural yoghurt)?	How often do you drink sweetened beverages such as Coca-Cola, Pepsi, Sprite, Fanta, orangeade, lemonade?
How often do you eat hard cheeses such as parmesan, pecorino, gouda, emmenthaler, cheddar, sapphire, ruby?	How often do you drink energy drinks such as Monster, 2 KC, Black Horse, Red Bull, Burn, Shot and others?
How often do you consume products that are sources of arginine (an amino acid) such as sunflower seeds, pumpkin seeds, squash, nuts, coconut, beans, soya, watermelon, tuna?	How often do you drink fruit juices?