Yotuel efficiently and gently cleans and whitens your teeth without detergent. Detergent is not necessary to clean your teeth and most of the Recurrent Aphthae Ulcers (RAU) are a consequence of the presence of Sodium Lauryl Sulphate in toothpastes. If you suffer from ulcers in your mouth, try any of our toothpastes and send us an e-mail with your experience.