I found out why the Crest toothpaste was so cheap after using it. It has the approximate consistency of baking soda, being powdery and not at all like normal toothpaste. The brushing experience is extremely unpleasant. The toothpaste tastes bad, and I don't feel that it cleans teeth well at all. To make matters worse, one of the ingredients of this Crest toothpaste--and the reason it is supposed to be whitening (I don't care about the whitening effect)--is titanium dioxide, a known carcinogen that causes lung irritation. Now I brush my teeth right before bed, and I am sure that I leave some amount of toothpaste residue in my mouth and subsequently inhale it while sleeping. So I think a connection might well be drawn from using Crest Whitening toothpaste to bronchitis, especially due to the timing of my infection (a few days after beginning use) and the highly unusual color of my phlegm--bright white, the color of titanium dioxide, rather than the yellow one might expect from bronchitis. I stopped using the toothpaste two days ago, and I'm already starting to feel better. I'm not going to buy any more Crest, regardless of variety, ever again, because in my opinion that brand does not know how to manufacture toothpaste.
I'm afraid all the brands have a variety with titanium dioxide, because CEO's tend to be evil and not care about the health of their