> There’s a persistence to the sour in Warheads. To prolong the pucker,
malic acid (the stuff that gives apples their natural tartness) is
coated with hydrogenated palm oil, which likely acts as an invisible
time-release mechanism. As the oil melts, it releases hits of malic
acid. Like citric acid, large quantities of malic acid can cause
dental erosion and canker sores, thus the product warning: “Eating
multiple pieces within a short time period may cause a temporary
irritation to sensitive tongues and mouths.”