does 5 minute teeth whitening kit work if i keep on the gel longer?

i have the 5 minute teeth whitening kit, with the pre wash and mouth tray. if i keep it on for bout a hour will the results be better? its been about 30 minutes now
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Probably will increase whiteness, but you can damage the porcelin layer on your teeth if you over do it !! Even the Dentists that perform whitening procedures will say the same.
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