並列摘要
Tooth whitening therapy is an important dental requirement for patients in recent years. It is important dental issue to understand the methods of the best way to do tooth whitening therapy for the patients. Tooth discoloration might be caused by dental caries or necrosis and some systemic or local factors may also be the key factors. Systemic effects include tetracycline stain, fluorosis and age factors. Local effects include smoking, tea, red wine and deep colored food. Tooth discoloration can be treated by bleaching or porcelain veneer restoration. This paper is going to demonstrate the principle of tooth whitening and the indication and contraindication for the bleaching and porcelain veneer restoration. This is a general view of tooth whitening for dentists and the patients.