Table 1 Ingredients and manufacturer of toothpastes used in the present study

Colgate optic white

Calcium pyrophosphate, propylene glycol, PEG/PPG 116/66 copolymer, PEG-12, glycerin, PVP, flavor, sodium lauryl sulfate, sodium saccharin, phosphoric acid, sucralose, butylated hydroxytoluene, water, sodium monofluorophosphate 0.76% (0.15% w/v fluoride ion), tetrasodium pyrophosphate, silica, hydrogen peroxide

Colgate Palmolive Company, New York, NY, USA

GO

Hydrogen peroxide

Colgate total whitening

Water, glycerin, sorbitol, sodium lauryl sulfate, flavor, cellulose gum, propylene glycol, carrageenan, sodium saccharin, titanium dioxide sodium fluoride 0.24% (0.15% w/v fluoride ion)—hydrated silica, PVM/MA copolymer, sodium hydroxide, triclosan 0.30%

Colgate Palmolive Company, New York, NY, USA

GT

Abrasivity

Perfect white black

Water, sorbitol, hydrated silica, glycerin, pentasodium triphosphate, sodium lauryl sulphate, aroma, PEG-32, cellulose gum, sodium fluoride, sodium saccharin, charcoal power and limonene, tetrasodium pyrophosphate, cocamidopropyl betaine

Beverly Hills Formula Company Dublin, Ireland

GP

Active charcoal components

Bencer charcoal

Deionized water, dicalcium phosphate dihydrate, glycerin, sorbitol, thickener silica, abrasive silica, sodium lauryl sulfate, mint allowed flavor, sodium carboxy methyl cellulose, polyetylene glycol 1500, sodium mono fluoro phosphate, methyl paraben,, saccharin sodium, propyl paraben menthol, activated carbon, tetra sodium pyro phosphate

Sormeh Company, Tehran, Iran

GB

Active charcoal components