Write the next sentence in this paragraph:

How to use the led light to whiten teeth with whitening trays
Brush and floss your teeth.
Clean teeth are instrumental for good contact between the whitening gel and the tooth surfaces.
Apply a small amount of the carbamide peroxide bleaching gel to the whitening tray.

Select from the following. [+] It is important not to accidentally coat your teeth but to gather the proper amount. Spray the gel onto your teeth with a wet sponge or toothbrush.. [+] Scrub the bristles of the hairbrush or floss under a soft toothbrush. Pour the toothpaste onto the tray.. [+] ( if you do not have a tray, order an impression set with your first supply of whitening gel. ) Insert the tray into your mouth.. [+] Use the toothpaste lightly to brush and floss your teeth. Scrub your teeth, brushing gently with a soft toothbrush and a gentle circular motion for about 20 seconds..
( if you do not have a tray, order an impression set with your first supply of whitening gel. ) Insert the tray into your mouth.