You may have seen a lot of ads for at-home teeth whitening kits and wondered if they’re worth it. Or, maybe you’ve been thinking about getting your teeth professionally whitened but are worried about the side effects. Teeth sensitivity is a common concern when it comes to teeth whitening. Teeth sensitivity is a common side effect of teeth whitening, but it won’t last long. This is because the whitening agents used to break up stains and discoloration on your teeth can also irritate your gums and the roots of your teeth. However, this sensitivity is usually temporary and will disappear once you stop whitening your teeth.