Dr. Al Internoscia discusses how to get back that dazzling white smile. Hillsborough, NJ Dentist people with stained or discolored teeth may just need a whitening procedure in order to restore their smile. People with stained or dull teeth usually benefit from whitening, which is a safe and effective way to brighten stained, discolored or dull teeth. Even a stubborn single tooth that is noticeably duller or less white than your other teeth can be individually brightened. Teeth bleaching products, which contain peroxides, actually change your natural tooth color anywhere from five to seven — but even up to twelve -- shades brighter. In general, bleaching works for most people. Tooth bleaching is most effective if your teeth are darkened from age, coffee, tea or smoking. Teeth darkened with the color of yellow, brown or orange respond better to lightening. Other types of gray stains caused by fluorosis, smo