Best dentist near me | What Causes Yellow Teeth Even After Brushing? Yellow teeth can appear even with regular brushing due to several hidden factors. Stains from coffee, tea, tobacco, and coloured foods gradually penetrate the enamel. Poor brushing technique or using the wrong toothbrush may leave plaque behind. Enamel thinning with age can also make teeth look more yellow. Certain medications and fluoride exposure can change tooth colour internally. Genetics plays a role in natural tooth shade as well. Professional cleaning and whitening help restore brightness safely. At Dr. Akkshaya Dental & Aesthetics, Adambakkam, we identify the cause and offer effective solutions for a healthier, brighter smile.