Teeth whitening remains one of the most economical ways to enhance your smile. Your smile creates an immediate, subconscious, visual impact on people you meet. A brighter smile gives the impression of youth, vitality, radiant health, happiness, and warmth. A bright smile is perceived as a healthy smile. There are no side effects for it

Hi sir....   Yellowish stains are due to many cause...    ** plaque and calculus **coffee and tea stains **flurosis ** Genetics **smoking ** Trauma... **If that yellowish discolouration is due to plaque,calculus,smoking ,it can be removed by ultrasonic scaling(cleaning) itself... **If that yellowish discolouration is due to mild flurosis,genetics then you can go for inoffice  teeth whitening ... Teeth whitening cannot cause any problem...some people will feel mild sensitivity temporarily...

Teeth whitening is a good option, little sensitivity if at all it is there, is temporary.

Teeth whitening with bleaching causes teeth sensitivity..go for bleaching if your teeth are really dark.. otherwise you cannot see much difference in colour change