Teeth may darken faster if exposed again to staining products such as tobacco, coffee or juices. However, the teeth will probably remain significantly lighter than if no treatment had been done. Two to four nights of bleaching performed at six month to four year intervals may be all that is necessary. Some difficult, darker stains may naturally require longer treatment than some milder stains. Depending on your teeth and type of staining, results will vary.
Some patients experience increased tooth sensitivity to cold while using bleaching products.
This will disappear in one to three days after interruption or completion of the treatment.