Tea Tree Oil Does The Trick Tea tree oil has mild antibacterial properties, so it's no secret that it can also give relief for an ear infection. It may seem silly because we're so conditioned to make everything go away with a pill, but a few drops of tea tree oil in the infected ear with the earache can go a long way. Just mix about 10 drops of warm tea tree oil with one tablespoon olive oil and drizzle the mixture into the affected ear as needed.