Some people may feel a slight tingling sensation or have minor discomfort during or after a teeth-whitening session. A few may have white spots, called blanching, on their gums as well. These effects are transient and quickly dissipate with a few minutes or so. Most people report no discomfort or sensitivity at all during or after their White Guys treatment. Different people react in different ways to chemicals and treatments, and this holds true for Cosmetic Teeth Whitening procedures as well as teeth bleaching products. White Guys recommends that if a client is experiencing pain or discomfort during the bleaching process, they should discontinue the treatment immediately and consult their dentist as soon as possible as this may indicate an undiscovered or unknown problem that might be occurring in their mouths.