Im 20 year old and have allot of calories as I tell earlier I have fillings and root canals with covers now I notice there are gaps occurring on the upper side /gum side of my teeth my tongue also turn a little yellowish but beside this I took good care of my teeth brushing twice a day and do flossing and use mouthwash after brushing this day by day worse condition of my mouth make me depressed I can not even pay attention to my studies.