Physicochemical and Pulp Tissue Dissolution Properties of Some Household Bleach Brands Compared with a Dental Sodium Hypochlorite Solution

By Jungbluth H, Peters P, Peters O, Sener B and Zehnder M PhD

Date: 10/2012
Journal: JOE


Purpose: to assess physicochemical properties of different brands of bleach and to investigate their ability to dissolve necrotic pulp tissue after the content of available chlorine was leveled.


•6 different brands of household bleach and compared with Chlor- XTRA and technical NaOCl solutions (control)

•2 assessment series were carried out: 1st the products in their original formulation, 2nd the household bleach solutions were diluted to 1.0% NaOCl.

•The solutions were compared regarding their chlorine content (wt% NaOCl), pH, alkaline capacity, osmolarity, surface tension, and price.

110  Bovine pulp tissue (n = 10 specimens per group) dissolution was assessed by test and control solutions adjusted to 1.0% NaOCl at 37C.

Most highlighted Results:

•The pH of undiluted solutions ranged between 11.1 and 12.7.

•Safeway Bleach Summit Fresh, had the highest pH and a higher alkaline capacity than other solutions

•Osmolarity was similar between products.

•The surface tension of Chlor-XTRA and Safeway Bleach Summit Fresh was about half that of the other solutions.

•Tissue dissolution was statistically similar among all solutions.

•Price was about 100-fold higher per liter of Chlor-XTRA compared with household bleach.

Clinical significance: 

Other than its price, the Chlor-XTRA solution had no unique features. In contrast to an earlier report, reduced surface tension did not result in greater soft tissue dissolution by NaOCl.