I need to get my teeth white by tomorrow?!

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try brushing your teeth with baking soda, wet your toothbrush and dip it into baking soda, brush for like 2 mins and rinse your mouth... they won't be white instantly but will be defo whiter

The previous answers give advice on how to get your teeth white over the next several weeks or months. Neither of them are any good for what you want.

Your best bet is to make an appointment with a dentist who offers "one hour whitening." In the US, the biggest brand of such products is Zoom, but I am sure the same process or something similar is available in the UK. That will make a big difference in the way your smile looks, and as the name implies, it will work in one fairly short treatment.

There are a few over the counter products that claim to do something similar, but I have heard they are not anywhere nearly as effective as either a professional one-hour treatment, or the longer term products like Crest 3D. If your appearance matters more than the cost right now and you only have one day, find a dentist that offers Zoom or other laser-type whitening. Good luck!!

Zoom whitening is a 1-2 hour in Dental office procedure that whitens your teeth drastically. usually this is done for a wedding or a special occasion. it is likely to cause sensitivity and you cannot eat or drink anything with color for the following 24hrs after the procedure. but it really whitens. It also may be a little costly so you may want to shop around. www.zoomnow.com

there are million brands of home teeth whitener but the best would be crest 2 hour