The apple strips are delicious, but we must not, of course, exaggerate it. If you eat several pieces of it in succession, one need not be surprised if after a whole mouth hurts, is precisely the case of acidic candies that.
In any case, the box is worth correctly because you long did anything about it. Maybe I eat so 1-2 pieces a day, sometimes more, and they really have a pleasant fruity and sour taste.