What's the difference between in-office and at-home whitening?

The biggest differences are the concentration of the whitening agent and the treatment period. Professional in-office whitening uses high-concentration agents and a light under the supervision of a dentist, with results typically achieved in 1 to 3 sessions. At-home whitening involves placing low-concentration agents in a custom tray and using them consistently for 2 to 4 weeks. 1) If you want fast results — professional whitening. 2) If you want to reduce cost and proceed gradually — at-home whitening. 3) Combining the two helps with long-term maintenance. It is safest to start after confirming the condition of your cavities and gums.