The longevity of your teeth whitening treatment results depend greatly on lifestyle and diet. As such this time frame will vary from person to person.
For Ultimate long lasting results we suggest coming back for a follow up session 6-8 weeks after your initial treatment. This will further increase your results as well as cement the treatment in to last longer.
After your follow up session, you should monitor your teeth for re-staining. A maintenance treatment will be required in between 3-12 months. You will find the new stains will lift alot quicker than at your first visits as these stains havent had a chance to set in over a long period of time.