Yellowing teeth can be caused by various factors, some of which are beyond your control, like genetics, aging, and illness, while others are influenced by daily habits. For example, smoking, certain medications, and poor oral hygiene can all contribute to discoloration. Genetics can make some people more prone to thinner enamel, which exposes the yellowish dentin beneath. Aging naturally leads to enamel wear, making stains harder to remove. Smoking, with its nicotine and tar, clings to enamel, while certain medications can affect saliva production and tooth structure, leading to stains. Additionally, illnesses like acid reflux and liver disease can also cause yellowing. To prevent yellowing, maintain good oral hygiene, use fluoride toothpaste, avoid staining foods and drinks, and visit your dentist regularly. If needed, professional whitening treatments or veneers can help restore a brighter smile