You may want to consider using the Google Disavow tool to disavow links if you notice that your website's search engine performance has been negatively impacted by low-quality or spammy backlinks. Some signs that you may have a problem with bad links include: - A sudden drop in your website's search engine rankings - A manual action penalty from Google - A large number of unnatural or spammy links pointing to your website - A significant increase in the number of low-quality or irrelevant links pointing to your website It's important to note that while disavowing links can help to improve your website's search engine performance, it should be considered as a last resort. The best course of action is to try to remove the bad links directly if possible. Before submitting your disavow file, make sure you have done your due diligence and have identified the links that you want to disavow. You should use backlink analysis tools such as Ahrefs, Majestic or Google Search Console to identify bad links. You should also use the filters and sorting options to identify links that are potentially harmful to your website's search engine performance. For example, you can filter out links from low-domain-rating (DR) websites, or links with keywords such as "porn" or "casino" in the anchor text. It's also important to monitor your website's search engine performance using tools such as Google Analytics and Search Console to see if there have been any changes after you've submitted the disavow file, if you see improvements, it means that the disavow tool was effective. If not, you may need to consider other ways to improve your website's search engine performance such as removing bad links directly or building good quality backlinks.