The Prophet (PBUH) mentioned several duas for many different purposes. Amongst them were many duas for protection.
Duas for protection from the evil eye, jealousy, calamities, illnesses, enemies, and the Shaytaan are all stipulated. Muslims must recite these duas regularly. The Prophet (PBUH) mentioned that dua is one of the tools for believers, which can even affect destiny.
Hence, duas are very powerful. Recital of Surah Al-Falaq and Surah An-Nas is amongst the most robust methods of protection from evil.