Ask if your DDS has a ultra-sonic tooth cleaner. My father is a DDS, and it seems like pretty standard equipment now a days. It cleans stains extremely well, 100% removal in my experience with no 3rd party whitening/staining chemicals used.

With your current strategy of brushing after coffee, I suggest waiting at least 15 minutes because the acid in tea or coffee does ST damage to your enamel, and it takes about 15 minutes for it to restore itself.

If you're looking to do it the most natural way, maybe baking soda is the best option for brushing? I don't know if I'd go so far as to call it Paleo.

I've heard that strawberries are supposed to help whiten teeth. Looks like you can combine with baking soda for a paleo-friendly treatment!

http://living.health.com/2008/02/21/how-to-whiten-your-teeth-naturally/

although i dont use it daily nowadays, for about one month i brushed every night with a 1:4 parts mix of redmond sea salt and baking soda. Simply dip a moistened toothbrush in the mix and brush like normal.

Both the salt and the baking soda are working simply as abrasives or surfectants, rather than chemically, according to what i've listened to, by the way.

At any rate, i definitely notice, and elicited at least a few comments, that my teeth looked whiter.

I like electric tooth brush and baking soda. I also swish some coconut oil...weird but seems to work??

I second that; drinking through a straw is best.

My dentist gave me something called MI PASTE to remineralize my teeth. I was having extreme sensitivity. I LOVE it. I just rub it on with my finger after brushing teeth. There is a fluoride and non-fluoride version. It has totally taken away the sensitivity, AND whitened my teeth. My teeth were starting to look not just yellow, but almost translucent. Slowly they are becoming hard and white again. It's not a dramatic effect (takes time) but you are building your teeth back up, rather than stripping them (which is what most whiteners do).

http://www.mi-paste.com/apply.php

http://www.coconutresearchcenter.org/article%20oil%20pulling.htm

I've been Oil Pulling after it was recommended on one of my questions and it seems to be working. I haven't been consistent with it but I'm now giving it a 30 day challenge. Probably the most paleo solution to the issue. You also get the bonus of a way to eliminate heavy metal toxins.

http://paleohacks.com/questions/22615/teeth-whitening#axzz1dcCkebxR

I found this in the comments on my question. Thought it was worth mentioning:

http://fondalashay.com/mintchilli/why-i-dont-use-toothpaste

Consider Britesmile or one of the other blue-light, intense-whitening technologies for which "cosmetic dentists" charge arms and legs. I would, if the alternative were to give up coffee. Not a freaking chance of the latter, not in this lifetime, not on this planet.

Get a cleaning from a hygienist. You'll have a smoother tooth surface. And smoother surfaces are the easiest to keep clean. You could even tell the hygienist that's your purpose and maybe you'll get a little extra polish and shine worked in even between the teeth.

Peroxide works, too, just be careful if you have any fillings and follow-up with some coconut oil and/or xylitol so your newly white teeth can remineralize while the stains are not there. Sounds kooky, but I watched a pin-hole cavity with confirmed depth close-up on that routine so now I have to be the one tell people about that and risk sounding kooky.

Oil pulling with coconut oil!

Just gargle coconut oil for twenty minutes after drinking your coffee, then spit it out!

3% Hydrogen peroxide gargle once or twice a week works for me. May want to get a cleaning first.