Antibiotics cannot cure a root canal infection because the source of the infection is inside the tooth where there is no blood supply; without blood supply there is no mechanism to deliver antibiotics. The cure is the complete shaping, cleaning and obturation (sealing) of the contaminated root canal space.
Thanks for the A2A, Joseph Boyle. You've already gotten plenty of answers, but since they differ a bit, I may as well cast my vote. According to http://Space.com The minimum distance from the Earth to Mars is about 54.6 million kilometers. The farthest apart they can be is about 401 million km.
The distance to Mars varies between the planet's closest approach to Earth at 35 million miles and the farthest distance at 140 million miles. In theory, it would take the fastest spacecraft ever built 39 days to reach Mars at its closest distance and 289 days at its most distant. Keep Learning.