Participants will be reviewed at 6 weeks and at 12 weeks. At both visits WSLs will be reassessed and categorised by a calibrated examiner (PI/SI) using ICDASii. Digital photographs will be retaken for analysis by other blinded, calibrated examiners and the where appropriate, the participants will be asked to bring their tube of unused crème to be weighed to help determine compliance to the study protocol. A decision has been made not to issue subject diaries to determine compliance as evidence in the Orthodontic literature hasn't found self-reporting of this type, in this area to be reliable. Participants will be asked to score the appearance of their teeth using the VAS again and subjects in the experimental group will complete a questionnaire on acceptability, taste and convenience of using the crème.