Tooth wear is most commonly caused by tooth grinding habits, usually during sleep. Exposure of the teeth to acidic substances (e.g. acidic foods and drinks) can also cause wear through erosion. Regardless of the cause, tooth wear presents both an aesthetic and structural problem, and can lead to damaged tooth nerves, and in severe cases, problems with the jaw joints. The rebuilding of worn teeth with crowns and veneers therefore improves both their appearance and their health.