Are Dex exchanges safe?

Could you elaborate on the safety of decentralized exchanges, or Dexes, in the cryptocurrency space? As an investor, I'm curious about the potential risks and security measures in place to protect my assets. How do Dexes compare to centralized exchanges in terms of safety? Are there any specific features or protocols that Dexes utilize to ensure user funds remain secure? Lastly, what are some of the most reputable Dexes currently available in the market?