Yep, my wife and daughter have the (strongest) 9.5% Pola White gel kit.
Works fine, as expected.
If you put too much gel on the tray, it can sting your gums a bit, but not to difficult to use overall.
Our local dental surgery uses SDI whitening products exclusively, and finds them the most consistent and easy to use.
They sell it regularly, and even our own dentist uses it herself.
Sign of the times......
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