Pro Comfort Gel

Apply before a whitening session and teeth stay calm during it. Apply after and they settle faster. Pro Comfort Gel is a thick, leave-on gel with potassium nitrate and hydroxyapatite that dentists use around in-chair whitening, packaged for the bathroom.

It is unflavoured on purpose. Most people use it immediately before a Pro Strip session, so a flavour would just clash. Left on overnight it doubles as a heavier-duty version of Enamel Shield for the weeks you are whitening hardest. A little goes a long way; a pea-sized amount covers the front teeth.

• 50 ml tube, roughly 40 applications
• 5% potassium nitrate, 10% hydroxyapatite
• Apply with a fingertip, leave for 5 minutes, spit, do not rinse
• Unflavoured
• Fluoride-free