Question: how long does it take for professional teeth whitening?
Answer: The most dramatic results -- teeth generally get three to eight shades brighter -- usually take several 30- to 60-minute in-office visits. Some dentists use techniques that can be done in a single 2-hour appointment (e.g. the Zoom system). The cost of in-office tooth whitening varies, but can range from $500 to $1,000.