 Patients attending the oral surgery department and the dental theatre for sedation procedures at Cork University dentalo school and Hospital and Cork University Hospital will be prospectively invited to take part. Patients will be randomly assigned to the study group standard monitoring and capnography or control group standard monitoring and blinded capnography . The sedation team will be blinded to the randomisation choice until after enrolment. A member of staff not directly involved in the study will conduct the randomisation. There is evidence for utilising intravenous midazolam in the age group 14 to 16years post pubertal for dentistry. Including this age cohort with parental consent will provide additional research data to add to the body of evidence. Patients will have intravenous sedation with midazolam primarily for the relief of anxiety and to help them to accept invasive procedures. The operative procedures will range from simple extractions to minor oral surgery procedures such as the removal of impacted wisdom teeth. 