The strips were easy to use. Just peel off them off and stick on your teeth. The adhesive is sticks really well so there's no risk of them falling off. I could taste a teeny bit of bitterness from the chemicals but honestly they're virtually tasteless.
I wore them for 30 minutes. I peeled them off and rinsed out my mouth to flush away any residue.
Here are the pics. Note none of these photos are photoshopped except for resizing.
I'm happy with the results since it was easy to use and you can notice a difference with just one application. And there was no noticeable sensitivity afterwards. The strips were cheap as I bought them online for 85p each. I will buy them again!