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.
When Mars is in Conjunction the Sun is between Mars and Earth. Opposition, or when the Mars is on opposite side of the Earth from the Sun, will occur approximately 390 days after conjunction. At opposition the Earth and Mars will be nearly in a straight line from the Sun. The physical diameter of Mars is about 53% that of Earth and has a polar diameter of 4,195.7 miles (6,752.4 km) and an equatorial diameter of 4,220.6 miles (6,792.4 km).