While on the subject of liquids and gels..

I carry a bottle of RX toothpaste on me with a high floride concentration.

I tend not to carry it when going abroad, unless it is a longer trip where I have a checked bag, but otherwise I carry it for most US domestic travel.

It has not been confiscated yet - I keep it in a plastic baggie separate from my "kippie bag", mainly to avoid problems if it were to leak; I put it in a bin right next to my "kippie bag" and most TSAers allow it to pass, but about 10% of the time I have to escalate and the supervisor OK's it.

I've found trying to declare it pre X-Ray typically creates problems -- instead I just put it through next to my kippie bag and then declare it as an RX post x-ray if a TSO gets excited or pees in their pants when they see "I have too many liquids".