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These trays can be used at home and at your dentist's office also.
If you contact a dentist for the purpose, he will create a special tray that is molded specifically for your teeth.
The tray once attached to your teeth has to be left there for a specific period of time.
This process might be prescribed to repeat for several weeks at least once a day.
Sometimes even it may be asked to put the tray on overnight and it is quite possible that the worse the stains are, the longer you will be asked to put them on.
The most important point that should be under concern is that the tray must be a perfect fit.
Because only then the whitening gel will be able to do its best otherwise the gel might come in contact with gums and soft tissues in the mouth and will cause irritation and uneasiness.
So if you buy a home kit that recommends you to put on the gel with the help of tray, it is possible that the general size tray might not fit in properly and the work done is not satisfactory.
Many people after applying the whitening gel with the help of trays have found that the whitening effect near the gums is not satisfactory.
This is obvious because if the tray is not exact fit, it will not be comfortable and will produce effects on the outer teeth and the part that is near the gums will be left unaffected.
So they are left stained partly or fully.
Teeth whitening trays are really helpful but only when they are perfectly fit into the teeth structure of the patient.
Now this is possible when you visit a dentist because he has the perfect tools to measure your shape of the gums and the teeth.
He will make the tray by accurately measuring it and then it will be a great fit anyway.
The results will be definitely positive and may be in one sitting or two your work will be done.
You can be free of the tension for a longer time as compared to doing it at home all on your own.
The only thing that worried people about contacting a dentist is that they will have to spend more for teeth whitening process.
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