Unfortunately, teeth whitening strips can cause a burning sensation in your gums and teeth. This is especially true if you aren't using the whitening strips properly - which is quite common.
The bleaching agent is peroxide (either hydrogen peroxide or carbamide peroxide) which is effective at getting rid of stains, but it can cause unintentional problems with your gums and teeth if not used properly.
Your gums may become inflamed and painful. Your teeth may even hurt. If you notice the burning sensation during applying the whitening product on your own, stop. Failing to stop when first feeling pain can lead to more serious gum inflammation and tooth pain.
Coming into the office and having your professional teeth whitening treatment plan created and monitored by a dentist can greatly reduce the risk of gum and tooth irritation.