Pohjola 2002.

Methods	Title: sensitivity and tooth whitening agents Trial design: randomised controlled trial Location: Medical College of Georgia Language: English Number of centres: 1 Recruitment period: not reported Funding source: not reported
Participants	Participants: 18 years old and above Total number: 12 Inclusion criteria: no medical condition; minimal gingival inflammation; no previous history of vital bleaching; A3 shade or above Exclusion criteria: active caries Number randomised: 12 Method of randomisation: not reported Method of allocation concealment: not reported Method of blinding: not reported Number evaluated: not reported
Interventions	Total number of intervention groups: 3 3 brands of commercial product with 10% carbamide peroxide Rembrandt Xtra comfort Nite White Excel Fx product Duration of treatment: 2 weeks
Outcomes	Improvement in tooth shade Vita shade guide
Notes	Sample size calculation: not reported Adverse effects: sensitivity and gingival irritation Key conclusions of the study authors: "There was no significant difference between the products with respect to improvement in tooth whitening. All 3 products produced sensitivity. Thermal sensitivity was less with Rembrandt Xtra comfort and Nite White Excel" Correspondence required: yes: missing data, P‐value not reported. Authors have been contacted Contact: Dr Randall M Pohjola, rpobjola2mail.mcg.edu