Brewer's yeast /garlic and ticks

Found a dead tick on my dog last night. Looked to have been dead for some time was flat and somewhat withered looking. funny thing is he doesn't have  any frontline on him at all. I bathed him Sat. to go to a microchip clinic, so the little evil 8 legged wasn't there at that time. I usually wait a day or 2 before applying anything  after giving a bath.
 
The only thing I've done is given him brewer's yeast w/ garlic and 1/2 dog vitamins every day.
 
Did that kill the tick?