Tooth whitening (termed tooth bleaching when utilizing bleach), is either restoration of natural tooth shade or whitening beyond natural tooth shade, depending on the definition used.
Restoration of the underlying, natural tooth shade is possible by simply removing surface (extrinsic) stains (e.g. from tea, coffee, red wine and tobacco) and calculus (tartar). This is achieved by having the teeth cleaned by a dental professional (commonly termed "scale and polish".
Dr. Ginnie Chen did her college undergraduate studies at UC San Diego. Her doctorate dental education was at Northwestern University in Chicago, where she received academic and clinical honors. Upon graduation, she received graduate honor awards from The Academy of General Dentistry and The American Association of Endodontics.