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  2. Tooth whitening - Wikipedia

    en.wikipedia.org/wiki/Tooth_whitening

    Teeth whitening has become the most promoted and mentioned methodology in cosmetic dentistry. In excess of 100 million Americans brighten their teeth using different methods; spending $15 billion in 2010. [85] The US Food and Drug Administration only endorses gels that are under 6% hydrogen peroxide or 16% or less of carbamide peroxide.

  3. Ammonia solution - Wikipedia

    en.wikipedia.org/wiki/Ammonia_solution

    Ammonia solution, also known as ammonia water, ammonium hydroxide, ammoniacal liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or (inaccurately) ammonia, is a solution of ammonia in water. It can be denoted by the symbols NH 3 (aq). Although the name ammonium hydroxide suggests a salt with the composition [NH + 4][OH −