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