mixed results

Uneven results are very common after bleaching. Consuming less foods and drinks that stain the surface of the teeth can contribute to a good result of teeth whitening. Approximately half of the initial discoloration provided by intensive in-office treatment (i.e. a one-hour treatment in the dentist’s chair) may be lost in seven days.[39] Reversion occurs when a significant proportion of the tooth whitening comes from dryness (which is also an important factor in causing sensitivity). [40] When the tooth is moistened, the tooth color “bounces back”, returning to where it began.