[Experimental study of variations of salivary pH affected by chewing cola].

Study on the theory that cola-chewing affects dental decays by changing pH in saliva shows--a short term increase in saliva pH (approx. 1.02) becoming normal again after 30 minutes. Spacing cola consumption out during the day and after meals rich in carbohydrates can compensate for the drop in saliva pH. The change in saliva pH is one of the factors which reduces dental decay in people who chew cola.