TODAY Dunkin is celebrating World Teachers’ Day by giving teachers free coffee. Teachers from pre-school age to college professors and school principals and counselors can enjoy a free medium hot or iced coffee at participating Dunkin’ restaurants. Dunkin’ Marketing Manager said, “Teachers are the backbone of our communities, educating the next generation of leaders to help keep our communities runnin’. We’re excited to offer our dedicated educators a free coffee to recognize their passion and hard work.”