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Using teeth whitner trays is a great way to improve the look of your smile. It can help you build more confidence as well since you will be able to smile big without the fear of people noticing your yellow teeth. This can also make your look more attractive as well. These trays can be a convenient way to get your teeth whiter since all you have to do is wear them for about 30 minutes a day. It may take up to 2 weeks to see the results depending on your teeth. There are a couple of different types of trays you can get. Some come in a kit where you insert the whitening gel into the trays with a syringe. The other way is to get trays that already have the gel in them.