Here is a whole fabulous website on Using Hydrogen Peroxide

Breaking down hydrogen peroxide
In this section we look at how hydrogen peroxide is broken down
•    in our bodies
•    in the bombardier beetle
•    to clean contact lenses
In our bodies
Our bodies make use of very many enzymes to catalyse specific reactions. We rely on them to keep our bodies working. 
Hydrogen peroxide is produced by reactions in our bodies. If it were allowed to build up it would kill us. Fortunately we have an enzyme in the cells in our bodies where hydrogen peroxide is produced called catalase. This enzyme catalyses the breakdown of hydrogen peroxide into harmless water and oxygen.



H2O + O2
In the bombardier beetle
The bombardier beetle lives in South America and relies on the enzyme catalysed decomposition of hydrogen peroxide to defend itself against predators.
The beetle has a gland on the tip of its abdomen that contains two chambers. One chamber contains a mixture of hydroquinone and hydrogen peroxide and the other contains a mixture of two enzymes, catalase and peroxidase. When the beetle is threatened it mixes the contents of the two chambers. The enzymes catalyse the decomposition of hydroquinone and of hydrogen peroxide. Both of these reactions are exothermic so the mixture gets hot. The oxygen from the decomposition of the hydrogen peroxide builds up a pressure that is used by the beetle to spray its attacker with a stream of hot, corrosive liquid.

Hydrogen peroxide is broken down in our bodies, in the bombardier beetle and in order to clean contact lenses.
Cleaning Contact Lenses
Contact lenses have to be cleaned regularly because a film of fat or protein tends to be deposited on them as they are used. Such deposits can act as substrates for mico-organisms which may damage the lens or the eye.
Decomposing hydrogen peroxide
The most often used procedure for disinfecting the lens is based on the oxidising effect of oxygen atoms released during the decomposition of hydrogen peroxide. The hydrogen peroxide used for this purpose has a concentration between 1 and 5% and is stabilised with 0.1% disodium EDTA so that it does not break down before it is needed.
How it works
After the contact lens has been rubbed with or immersed in the hydrogen peroxide solution, any remaining peroxide must be destroyed because it could damage the eye. This is achieved by adding a solution of catalase to catalyse the decomposition. In older cleaning procedures, the decomposition was achieved with the help of a metal catalyst coated in platinum. A one-stage process has now been developed in which the contact lens is placed in hydrogen peroxide solution together with a tablet that swells up and releases catalase when it becomes wet. The amount of catalase and the rate at which it is released are carefully controlled so that the hydrogen peroxide has time to clean the lens and there is sufficient catalyst to decompose all of the peroxide. The lens can be worn without any further treatment.

Teeth Whitening Carbamide vs Hydrogen Peroxide

Carbamide vs. Hydrogen Peroxide
The first thing you should know about hydrogen peroxide teeth whitening is that it is what dentists use for chair-side, in-office treatments. No dentist would ever use Carbamide Peroxide teeth whitening for an in-office treatment – they give patients take-home kits with Carbamide gel but will never use it in office. Dentists get the best results in our industry because they use a very high concentration of hydrogen peroxide gel, so you should use what dentists use to whiten teeth but in a concentration that does not require a gum protector. Anyone that tells you that dentists use carbamide peroxide gel is not correct, since no dentist uses it for in-office treatments. Call any dentist at random from the phone book and you’ll confirm this (but make sure you specifically ask what they use for light-activated in-office bleaching).

Hydrogen Peroxide Teeth Whitening
When you get your teeth whitened, hydrogen peroxide is what actually whitens them. Even if you are using carbamide peroxide, what actually whitens your teeth is hydrogen peroxide. Something that many people don’t know is that carbamide peroxide is made from hyrdrogen peroxide. To create carbamide peroxide, a urea molecule is added to the hydrogen peroxide molecule and the result is carbamide peroxide. Please note that there is a 3:1 relationship between carbamide and hydrogen. For example, 12% hydrogen peroxide is theoretically equivalent to 36% carbamide peroxide. However, as you’ll see below, this doesn’t mean that you’ll get the same results with 36% carbamide and 12% hydrogen peroxide. So don’t think that because someone offers you 35% carbamide that you are getting a 3x higher concentration than 12% hydrogen peroxide.
Note:New Rules In Australia For Selling DIY Teeth Whitening Products
Our New Whitening Gel complies with the new Australian Poisons Act 2011. This act now prohibits the sale of whitening gels / agents over 6% Hydrogen Peroxide & 18% Carbamide peroxide in Australia by non dental care providers. We are adhering to these new rules and take them very seriously. Please support us and avoid & report those websites who are not complying. Reports can be made to the Australian Competition & Consumer Commission (ACCC)

Carbamide Peroxide Teeth Whitening
In order for carbamide peroxide to whiten your teeth, it must first break down into hydrogen peroxide. The problem in using carbamide in chair-side treatments that are 15 to 20 minutes is that it takes at least 15 minutes for carbamide peroxide to begin to break down into hydrogen peroxide (and longer to completely break down). Only when the carbamide peroxide has broken down into hydrogen peroxide can it begin to whiten your teeth. So if you use carbamide peroxide for teeth whitening during a 20-minute treatment, your customer will only have a little hydrogen peroxide on his/her teeth for 5 minutes. That’s why most people that use carbamide peroxide are not happy with the results.
Obtaining good results for your customers is the most important thing in this business, so make sure you use proper gel. If you really want to use carbamide. make sure you are performing at least a 40-minute sessions if you really want any results. However, if you can get the same results using hydrogen peroxide in 15 minutes, why would you want to do 40-minute treatments? If you want results in a 15-20 minute treatment, the only option is hydrogen peroxide, and preferably at a concentration of 6%.
Most DIY teeth whitening suppliers choose to use carbamide peroxide because it causes less gum irritation than hydrogen peroxide. However, it doesn’t cause gum irritation because it doesn’t become hydrogen peroxide till the end of the treatment. The Beaming White system uses 18% Carbamide peroxide and gives little or no gum irritation along with spectacular results. If you don’t believe the scientific study and if you don’t believe us that this is the best system, get some of our kits and get some from another supplier and compare the results. Nobody else will suggest this to you. We do because we know that after trying it you’ll continue to use our products
You can see and order our products at our eBay Shop

Carbamide peroxide & Hydrogen Peroxide for teeth whitening.

The whitening agent (either carbamide peroxide or hydrogen peroxide) penetrates the enamel to reach the discolored molecules inside your tooth

The whitening agent (either carbamide peroxide or hydrogen peroxide) penetrates the enamel to reach the discolored molecules inside your tooth

Most people are familiar with carbamide peroxide since it is the agent most commonly used for bleaching (whitening) the teeth.  The dental profession has recently begun to recommend carbamide peroxide as a means of preventing periodontal disease and tooth decay in patients who are unable to carry out normal oral hygiene measures such as regular brushing and flossing.  For patients like these, rubber trays are fabricated to fit over both the teeth and the gingiva.  The tooth indents in the trays are filled with 10% carbamide peroxide and the patient wears the trays for two hours once a day, or overnight.  The carbamide peroxide breaks down into 3.5% hydrogen peroxide and 6.5% urea when it contacts plaque.  The urea further breaks down into ammonia and carbon dioxide under the action of bacteria.  The hydrogen peroxide kills the plaque bacteria, and the ammonia raises the PH of the plaque neutralizing the acid that causes tooth decay.

Hydrogen Peroxide does not harm teeth, in fact it keeps the mouth free of harmful bacteria.

Hydrogen Peroxide Harmless or Not?

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