Unfortunately, there are some side effects to tooth whitening, and you should be careful about which products or methods that you select.
The first step in answering the question "Can Tooth Whitening be harmful?" is to look to the dentists and medical organizations that allow these products to be put into use. Read the labels and warnings, as these will give you some idea of the risks involved with using any specific product and the side effects associated with tooth whitening. One of the most "harmful" aspects of whitening involves the aching in teeth and gums that occur while the process is underway. This ache is due to the harsh chemicals that allow the bleaching process to occur on the enamel of your teeth. As the chemicals do affect the enamel, which protects the tooth, your teeth and mouth are more open to problems such as mouth cancer. While there is some evidence that whitening can cause cancer, there is little information on the exact agent that creates this risk.
When asking "Can Tooth whitening be harmful", you must also consider the other methods that you have open to you. As the cost of laser teeth whitening is very high, the slight risks associated with this method may be worth it to you, if you are determined to have a whiter smile without spending the months of consistent brushing to obtain that smile. In any case, the first step to having a better smile is to maintain good dental hygiene. Without this, all of the efforts you make to brighten the color of your teeth will be in vain.