Teeth whitening with carbamide peroxide under dentist supervision is safe for teeth and gums. Some patients experience increased tooth sensitivity and temporary discomfort of their gums. These symptoms tend to disappear 1-3 days after stopping the whitening process.
Over-the-counter teeth whitening kits may cause problems that you may not be aware of, such as irritation of the gums and surrounding soft tissue. Over use of over-the-counter home teeth whitening can erode tooth enamel largely because these kits have high acid content.
The best and safest way to whiten your teeth is under dentist supervision.