Which one out of the three would be best?

I think they are about even with the whitening. I like brushing my teeth the best. If you want extra you could use the pen. It really depends on what you want out of it. Younger people want to keep their teeth really white , so the toothpaste and the whitening pen would be a good combo. I hope this was helpful

Can product be used on dentures?

(Answer from Colgate's page) While you may be tempted to try to whiten your dentures with at-home teeth whitening solutions, such as whitening toothpastes or bleach-containing products, the Mayo Clinic says these methods are generally not safe for your dentures. Abrasive Cleaning Products like stiff-bristled toothbrushes, harsh toothpastes and cleaners can scratch your dentures and ruin their bright and shiny sheen. *Hope that helps!

What exactly are the differences between the stain, enamel and fresh versions? They all say they have 5% H.peroxide?

The biggest difference is the enamel strength version contains 1.14% sodium monofluorophosphate (fluoride) where as the stain and fresh only contain .76% sodium monofluorophosphate. The fresh version also has a different flavor profile.

Product Name	Pro Series
Units	6 Grams
Brand	Colgate
Format	Paste
Age Range Description	Adult

Optic White Pro Series Whitening Toothpaste with 5% Hydrogen Peroxide, Stain Prevention, 3 oz Tube, 2 Pack

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