terrible allergic reaction [SEP] i ve dont have any known allergies nor have i had an allergic reaction to any other oral care products over the years i also don t have any know oral health issues i simple bought this to strengthen enamel and whiten teeth but after using it the night before i woke up with a scary swollen mouth tongue cheeks gums and lips be very careful with this product use a small amount to test before rinsing your entire mouth like you normally would