I'm a total toothpaste-tart because of those little tubes; I'll use whatever comes along. My dentist receives them by the boxload, presumably as promotional items from the various manufacturers vying for recommendation, and dumps them in a crate at reception for free distribution.

So every six months I stock-up on a cocktail of various toothpastes and just use whatever comes out of the bag next.

The only one that was jarring was Corsodyl, and it even had a little chart on the reverse showing that people needed three months ot so to adapt to its taste. I persevered with it because it was free but wouldn't choose it voluntarily.