"The Chios Gum Mastic (mastiha) is an essential ingredient of ELMA gum. Mastiha is a natural resin, known since antiquity to the people of Eastern Mediterranean countries, who chewed it to clean their teeth and sweeten their breath. It was the very first natural chewing gum of the ancienct world. ELMA chewing gum does not contain any source of phenylalanine, BHT & BHA antioxidants. ELMA chewing gum contains natural Chios gum mastic and mastic oil. For this reason, taste and smoothness may vary."