This is how an Opalescence Boost session at Uptown is done. Step 1 — We determine the shade of your teeth with a shade guide. Step 2 — We then place a lip and cheek retractor and a bite block. These protect your tongue, cheeks, and lips from the whitening gel. Step 3 — A gum barrier is then drawn onto the gumline around all the teeth to be whitened. This barrier will completely protect your gums from the whitening gel. Step 4 — The Opalescence Boost gel is then painted onto each tooth. The gel is allowed to stay on the teeth for 20 minutes. Step 5 — We suction away the gel and check the degree of whitening. If more whitening is needed, we can apply the gel up to two additional times for 20 minutes each. Step 6 — We rinse off your teeth, remove the gum barrier, and you’re done. And the whole process took just an hour.