If you get them frequently (like I used to), you might consider switching toothpastes to one without Sodium Lauryl Sulfate (SLS). This seemed to lower my frequency from one a week to one every couple months (or longer). In the average store, there will probably only be two or three kinds that are "SLS-free" (I'm currently using Sensodyne).
On a side note, I always carry a tube of Anbesol gel when I get bad canker sores .. nothing beats instant numbness.
LeChuck
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