A Dental Bleaching Survey on Two Bleaching Systems and Their Effect on Nitric Oxide and Catalase Enzyme in the Gingival Crevicular Fluid

Objective: This study was carried out to examine the effect of two in-office bleaching systems by measuring the level of catalase enzyme (CAT) and nitric oxide (NO) in the gingival fluid (GCF) before and after bleaching. In addition, each participant was asked to fill out an online survey to examine their satisfaction with the bleaching procedure. Materials and Methods: Thirty-six healthy young participants were selected. They were divided into two groups according to the bleaching system used; Philips Zoom White of 25% H 2 O 2 or Fläsh White Smile of 32% H 2 O 2 . Three sessions, 15 minutes each were performed in the same visit for each participant. The (GCF) samples were collected using a sterile periopaper before and after the bleaching session. A survey link was sent to all participants to examine their satisfaction. Results: There was a statistically significant increase in (CAT) and (NO) in the (GCF) of the Fläsh group when compared to the Zoom group. Participants reported 94% satisfaction with both bleaching systems. There was no statistically significant difference between the Fläsh and Zoom groups in all participant's answers except in the degree of gingival pain where the number of participants who reported no or mild pain in the Fläsh were greater than those in the Zoom. Conclusion: The higher percentage of H 2 O 2 in Fläsh group resulted in the increase of (CAT) and (NO) release in the (GCF). Participants in both groups were equally satisfied. Clinical relevance: Risks from dental materials have to be evaluated to prevent endangering human health.