Question: How to get teeth professionally whitened.

  Options: 
 A. Your Dentist will place bleaching gel in a tray and fit in your mouth against your teeth, then use a laser for 30 minutes or less to keep teeth warm.
 B. Your Dentist will place bleaching gel in a tray and fit in your mouth against your teeth, then use a laser for 30 minutes or less to activate gel and whiten quickly.
Answer: B