30 orthodontic patients (n=15 per group), who are awaiting exposure and bonding of a palatally impacted canine tooth, will be selected from the waiting list at Birmingham Dental Hospital. Potential participants will be invited to take part in the study; they will be given verbal and written information. If they are happy to take part, written consent will be obtained. All patients recruited will be competent and capable of making the decision. For patients under 16 years of age, parental/legal guardian consent will be obtained. The patients will be able to withdraw from the study at any time, should they not wish to continue participating.