Immediately Before Use
Brushing your teeth before using Crest whitening strips will not give your teeth and gums enough time to recover from the abrasive cleansing. When you apply the strips, you may feel irritation or sensitivity from the gel on the brushed areas of the gums and mouth.
Earlier in the Day
Brush your teeth a few hours beforehand if you plan to use Crest Whitestrips the same day. Allowing time between cleaning your teeth and using the strips will give your teeth and gums time to recover from the brushing. Your gums and mouth will be less susceptible to irritation and sensitivity the more time between the two.
Crest suggests you brush your teeth a few hours before using the whitening strips. You can then brush your teeth immediately following the whitening. This will remove any of the remaining gel that the strip left behind. Between using the strips, the use of Crest whitening toothpaste can remove stains that occur throughout the day.