Having just eaten an untoasted Subway flatbread sandwich, I noticed the bread tasted like flour and had an unpleasant texture. I googled the topic to see if anyone else experienced that taste and feel.

Having just eaten an untoasted Subway flatbread sandwich, I noticed the bread tasted like flour and had an unpleasant texture. So they "have" to toast it to make it taste good, not for any weird reason about chemicals.