
The
pink on the toothbrush develops overnight and continues
to get worse each time I use it. The
pink doesn't immediately appear. In addition, I just bought a Sonicare UV sanitizer and since I've been using it, the pink on my toothbrush has all but disappeared. That, of course, is not to say that the problem has been eradicated, but it is indicative of bacteria causing the discoloration. This is just a "self-diagnosis.