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Alright, here?s my summary.  I got a ton of great responses- thanks everyone!

A bunch of people say that baking soda is just fine, though some 
cautioned it can be abrasive.  A few use it along with sea salt.  
Rinsing with peroxide was also a common suggestion.  A couple of people 
wrote that using a brush with nothing on it in conjunction with 
Listerine (all flavors are GF) works for them.  One person suggested 
eating an apple after a meal might help.  Another suggested a mixture 
of half salt, half baking soda.

A couple of more unusual suggestions I got were using Neem bark or 
oregano oil.  Apparantly both of these work well and have general 
health benefits.  I?ve also included an excerpt about melaleuca oil at 
the bottom of this summary.  There was an interesting response about 
Tooth Soap as well, which was sent to the general list.

Many kinds of toothpaste were mentioned as being GF.

Kinds of toothpaste:
Desert Essence Tea Tree Oil and Neem Toothpaste - 1
Arm & Hammer Baking Soda Toothpaste - 1
Aquafresh Sensitive ? 8
Tom's of Maine ? 7
Crest ? 5
Rembrandt Intense Stain Fresh Mint Flavor toothpaste ? 1
Peelu Peppermint natural toothpaste ? 1
Mentadent Fluoride with Baking Soda ? 1
Biotene ? 3
a Swiss brand called Elmex ? 1
Colgate ? 4

I was dismayed to learn that Sensodyne wasn?t considered GF in the 
first place, as attested to by the company.  I?m very glad to be done 
with it.  I?m not sure exactly which solution I?m going to choose in 
the end, and though it will probably not be toothpaste, I have a lot 
more options now. :)

Thank you so much for responding, you?ve been a great help!
Susan

melaleuca oil:
?My husband has DH so I try to keep only products in the house that act 
as medicine as opposed to being poison to his system - from food to 
laundry detergent to toothpaste. He too has sensitive teeth and what 
we're using now that has actually improved -- yes IMPROVED -- his gum 
and teeth sensitivity. It's a product from Melaleuca, The Wellness 
Company. It has melaleuca oil in it which is truly an amazing plant oil 
from Australia. It's properties are so healing: I burned myself SEVERLY 
on my right hand (about a 3 inch square area) with boiling water. For 
several weeks, I rubbed straight melaleuca oil on the burn and now, the 
only person who knows I burned myself is me - the oil not only healed 
the skin, but healed it so there's no scar! Amazing. My doctor is 
amazed!
    Back to the toothpaste -- the melaleuca oil really does help the 
gums and neither one of us have had any problems with our teeth since 
we started using it - he only started about 4 months ago but I've been 
using it for 2-3 years. The last dental hygiene visit didn't have him 
leave in pain, like it used to. That's such an improvement!
    You can go to www.melaleuca.com to find out more about the company. 
You have to join to get the best prices, much like Shaklee company, but 
many of their products have been cheaper and better than items I've 
purchased in the stores and they're beneficial as opposed to being 
toxic. HOWEVER, there are some that I don't care for, so I'm not a 
die-hard fan.?

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