Yellow teeth can develop gradually because of tea, coffee, smoking, tobacco, poor brushing habits, plaque buildup, ageing, or staining from certain foods and medicines. In some people, the yellow shade is only on the surface, while in others it may be related to deeper enamel changes. The good thing is that many cases improve with proper dental cleaning and regular oral care. Brushing twice daily with a gentle technique and cleaning the tongue properly may help reduce staining over time. Tobacco products, excess tea or coffee, and coloured soft drinks often make teeth appear darker, so reducing them may improve the appearance slowly. Professional dental cleaning can remove hardened plaque and surface stains more effectively than home remedies. Whitening toothpastes and bleaching treatments are also available, but they should be chosen carefully because excessive whitening products may increase tooth sensitivity or damage enamel if used incorrectly. If there is pain, bad breath, bleeding gums, sensitivity, or thick deposits on the teeth, a dental examination would help identify whether the discolouration is due to staining, decay, or gum-related problems.