Why does my front right side brake on my 94 Toyota Carolla wear out every three months?

My 94 Toyota Carolla has had its brakes changed over 10 times in the past 12 months. For some reason, the front right side wears out much sooner than the left side. The left side is maybe 50% worn while the right side is 95% worn down.Why does my front right side brake on my 94 Toyota Carolla wear out every three months?Sounds like you might have a little bit of air or a tight caliper on the left side. It would make the right get used alot more than the left. The car would be using the right to stop most of the weight.