anything with ';acid'; in the ingredients list. If you don't have a bottle then perhaps you should buy one.
NaOH is sodium hydroxide: opposite of acid.
Citric acid is common in both shampoo and mouthwash: also look for acetic and phosphoric acid.What ingredient/s make shampoo and mouthwash acidic?
How shampoo works
Shampoo cleans by stripping sebum from the hair. Sebum is an oil secreted by hair follicles that is readily absorbed by the strands of hair, and forms a protective layer. Sebum protects the protein structure of hair from damage, but this protection comes at a cost. It tends to collect dirt, styling products and scalp flakes. Surfactants strip the sebum from the hair shafts and thereby remove the dirt attached to it.
While both soaps and shampoos contain surfactants, soap bonds to oils with such affinity that it removes too much if used on hair. Shampoo uses a different class of surfactants balanced to avoid removing too much oil from the hair.
The chemical mechanisms that underlie hair cleansing are similar to that of traditional soap. Undamaged hair has a hydrophobic surface to which skin lipids such as sebum stick, but water is initially repelled. The lipids do not come off easily when the hair is rinsed with plain water. The anionic surfactants substantially reduce the interfacial surface tension and allow for the removal of the sebum from the hair shaft. The non-polar oily materials on the hair shaft are solubilised into the surfactant micelle structures of the shampoo and are removed during rinsing. There is also considerable removal through a surfactant and oil ';roll up'; effect. The foamy effect achieved by massaging shampoo into the hair is purely aesthetic.
MOUTHWASH
Mouthwash or mouth rinse is a product used for oral hygiene. Antiseptic and anti-plaque mouth rinse claims to kill the bacterial plaque that causes caries, gingivitis, and bad breath. Anti-cavity mouth rinse uses fluoride to protect against tooth decay. However, it is generally agreed that the use of mouthwash does not eliminate the need for both brushing and flossing. In the absence of a ready-made mouthwash, gargling with plain water is preferable, to remove food particles, sugars and other pollutants in the mouth
Composition
Active ingredients in commercial brands of mouthwash can include thymol, eucalyptol, hexetidine, methyl salicylate, menthol, chlorhexidine gluconate, benzalkonium chloride, cetylpyridinium chloride, methylparaben, hydrogen peroxide, domiphen bromide and sometimes fluoride, enzymes and calcium. Ingredients also include water, sweeteners such as sorbitol, Sucralose, sodium saccharine, and xylitol (which doubles as a bacterial inhibitor).
Sometimes a significant amount of alcohol (up to around 20%) is added, as a carrier for the flavor, to provide ';bite'; and to contribute an antibacterial effect. Because of the alcohol content, it is possible to fail a breathalyzer test after rinsing; in addition, alcohol is a drying agent and may worsen chronic bad breath. As such, it is possible for alcoholics to abuse mouthwash. Recently, some assumptions were made of a possible carcinogenic character of alcohol used in mouthrinses, but no clear evidence was found. Commercial mouthwashes usually contain a preservative such as sodium benzoate to preserve freshness once the container has been opened. Many newer brands are alcohol-free and contain odor-elimination agents such as oxidizers, as well as odor-preventing agents such as zinc ion technology to keep future bad breath from developing[citation needed].
A salt mouthwash is a home treatment for mouth infections and/or injuries, or post extraction, and is made by dissolving a teaspoon of salt in a cup of warm water. Plain (diluted) hydrogen peroxide is another common mouthwash.
One thing to note is that many commercial mouthwashes are very acidic on the pH scale. If you have heartburn, acid reflux or acid indigestion, it is important to use a mouthwash with a neutral pH to avoid irritation.
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