Melvyn> I can only guess. Perhaps you have a choice between EITHER
brushing the bleach on your teeth just as you might brush on toothpaste
OR using the tray ...
That would be my understanding.. , but I think the wear-in part could
be an attempt at saying somethng like 'wear the gel on your teeth in
the tray/using the tray' .. a bit clumsy, I know, but that's the only
thing I can imagine..
So yes, it's either brush the whitening gel on or put it in the tray
and "wear" that... as for five minutes before and after *whitening*
your teeth, I think they were meaning to say before and after
*brushing* your teeth (with ordinary toothpaste) - that's usually the
way these things are used, I understand..
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