I don't think these sites would be of help as this person is asking about "Fever Blisters" (caused by a virus - Herpes Simplex) while these sites are about canker sores (usually caused by acidic foods).
As to why the terminator is not workng... I DON"T KNOW.. And you may be right, I suspect 'truth in advertising' is a limited commodity with A LOT OF GADGETS... And of course, if just 'ONE' person has a cure or relief that is coincidental with the use of these things, the manufacturer will report 'a miracle cure' is due to their machine.. Oh Well.
A number of people claim, in theory, that these things work.. Again, I don't know but have thought about buying one. Some others report 'feelng better, or seeing worms or parasites. So WHo knows.