Hi Tony, there is a great deal of evidence that suggests that power whitening does not give a very stable long term result. The nest results I have had is a combination approach using disposable trays and custom made trays. I cannot offer advice as to whom may be suitable in Leeds city centre but I am confident there will be numerous people who can help you. I am based in Doncaster which from what u describe may not be feasible due to time constraints, otherwise I would be happy to help
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