roof of mouth is yellow and tongue plus i have chronic allergies and asthma they did a throat cultrure and found nothing and an xray of my neck it was negative /i have bad breath and went from having a sore throat to a scratchy throat and its been 4 weeks.and i have lot of Mucus in my throAT BUT YET THE DOCTORS CANT FIND NOTHING SO IM SEEING MY REGULAR DOCTOR AND ASKING FOR AN ALLERGY DOCTOR AND AN ENT DOCTOR AM IN THE RIGHT DIRECTION sorry about the caps.im used to using a macbook not a desk top.