Box (3). ****PLEASE NOTE THAT IF YOUR PURCHASING THIS PRODUCT WITHIN THE EUROPEAN UNION, IT CAN ONLY BE PURCHASED BY A REGISTERED DENTIST. Whitening gel syringe 3 x 2.4ml 16%. Indications: Gentle and permanent tooth whitening for vital and non-vital teeth e.g. in cases of staining due to medication, fluorosis, food, trauma, ageing etc.