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Carbamide peroxide with no expiration?

I had my teeth whitened in 2008 with custom made trays made by my dentist using 16% carbamide peroxide. I have two left overs after all these years. Can I use them? I can't find expiration dates?

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From board-certified doctors and trusted medical professionals
Dr. David M. Schertzer, DDS
Dr. David M. Schertzer, DDS
Dentist
Answered on Jan 16, 2017
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Want to get my teeth whitened, however my dentist basically told me it's impossible? (photo)

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Kathy Frazar, DDS, FAGD

There are several options for whitening teeth or bleaching them and some methods are more effective than others. Some dentists opt for cosmetic contouring, using a bonding material to cover teeth. If your current family dentist isn't giving you the answers you were hoping for it doesn't hurt to ...

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