Steps

1) Read the instructions carefully. Although most whitening strips are applied and used in a similar manner, some brands may have different instructions. Always read the instructions fully and be aware of any side effects before using any whitening strip or whitening product.
Misuse can cause damage to your teeth, gums, and health.
Instructions can vary between brands, always fully read the instructions before use.

2) Brush your teeth. Before you apply your whitening strips, you will need to brush your teeth. If you apply them without brushing your teeth, you may inadvertently trap food or bacteria under the strip and the surface of your teeth will not be in contact with the whitening substance, which can lead to an unappealing looking result. Brushing your teeth can also help remove any plaque that may block the whitening effects of the strip on the enamel.
Brushing your teeth will allow the hydrogen peroxide in the whitener to penetrate your enamel better.
Brush your teeth at least a half hour before you apply the strips to let saliva clean away any excess fluoride and get the enamel ready for whitening.

3) Prepare your strips. Before you apply the strips to your teeth, take a moment to make sure you are applying the right strip to the correct location. Some whitening strips will have special strips for top and bottom teeth and all will have a certain side of the strip that must contact the teeth. Take a moment and learn which strip goes where.
Apply the side with any gel to your teeth. This gel is the whitening agent and must contact the entire surface of your teeth except the gums to work properly.
The smooth side of the strip will have no whitening gel and is there only to help you apply the strip.
4) Apply the strips to your teeth. Having determined which way your strips need to be applied, place them over your teeth, with the gel coated side making contact with the surface of your teeth. Make sure the strip covers your teeth entirely, working out any bumps or uneven areas.
Try drying the surface of your teeth with a napkin or towel before applying the strips. This will help increase the whitening effect. You can also use a cheek retractor to spread your lips and control the flow of saliva during the whitening treatment. Less moisture in your mouth will give you a better result.
A tooth brush can be used to smooth the strip out if needed.
Completely covering your teeth without any irregular areas will help evenly whiten your teeth.
Avoid allowing the strips to reach up and cover your gums, as this can cause irritation or even slight burns that will make your gums look white.

5) Wait for the strips to finish working. Once you have applied the strips you will need to patiently wait as they work on your teeth. Most brands will have a slightly different amount of time they recommend you wear the strips, so carefully read your instructions. Avoid touching the strips to allow them to work uninterpreted.[4]
In general, you will wait for around 30 minutes, before removing the strips.
In order to keep your teeth dry during the whitening procedure you can try lying in bed on our back, keeping your mouth a little bit open. This will reduce the quantity of saliva, which may interfere in the whitening process. Try breathing through your mouth for a while as well to help dry out your mouth.

6) Take the strips off. After the amount of time that your specific strips have instructed you to wear them has passed, you will need to remove the strips. Peel them away from your teeth and throw them away when it is time to remove them.
Don't leave them on longer than specified as this can cause irritation and sensitivity in the teeth and gums.
Leaving the strips on for a longer amount of time won't increase the whitening results.
Clean your mouth after using the strips. Try rinsing with water or brushing your teeth to ensure that all the whitening gel is out of your mouth. Try not to swallow too much of the gel as it can be toxic.
For the best results, avoid eating anything for an hour after your treatment.

7)Repeat the process. Whitening strips work over time, utilizing slow exposure to the chemicals responsible for the whitening process. You will need repeated use of the strips before you see any noticeable difference in how white your teeth are. Keep using the strips for the recommended amount of time to get the most out of them.[6]
Use twice daily for 30 minutes at a time.
Once you get the shade you desire, use the strips once a month as a refresher to maintain them.
Sustained results can be expected at around four months, but they also work well after a professional teeth whitening in a dental office.

Avoid certain foods. Some foods can cause your teeth to become stained, resulting in a yellowish coloration, which is more likely to produce results much faster than normal if you are using strips. Other foods can cause your enamel to wear down, which can lead to tooth damage and pain. Try to avoid some of the following foods and drinks as you work to whiten your teeth:
Coffee, tea and wine can cause your teeth to become stained.
Sugary foods or highly acidic drinks, like orange juice or soda, can wear the enamel away on your teeth. This can cause cavities or other dental issues.

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