The honest answer? Yes, and no. Credit repair is a great way to improve your credit score, if the problem is caused by a disputable error. If your credit score is poor because of a giant pile of debt — debt that you legitimately owe — then credit repair may not be the right solution. Determining which path to take will be based upon those considerations as well as any other factors that may be unique to your situation — and this is something only you can decide.
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If you find information that is incorrect, you can file a dispute. Remember too, that items on your credit report that you don't recognize could also be potential signs of fraudulent activity — someone working to secure credit in your name for their own use. Make sure you're clear on items that could potentially be fraudulent, versus those that may simply be inaccurate.