Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
RCT 3-armed trial	74 people	Pruritus 1/24 (4%) with triethanolamine polypeptide-based proprietary preparation 2/26 (8%) with carbamide peroxide-based proprietary preparation 0/24 (0%) with saline	Significance not assessed
RCT 3-armed trial	74 people	Discomfort 0/24 (0%) with triethanolamine polypeptide-based proprietary preparation 0/26 (0%) with carbamide peroxide-based proprietary preparation 1/24 (4%) with saline	Significance not assessed
RCT 3-armed trial	74 people	Contact dermatitis 1/24 (4%) with triethanolamine polypeptide-based proprietary preparation 0/26 (0%) with carbamide peroxide-based proprietary preparation 0/24 (0%) with saline	Significance not assessed
RCT 3-armed trial	89 people	Adverse events with potassium carbonate/ethyl acohol/glycerol 480/thymol proprietary preparation with saline