He competed in the Heavyweight division. He lost his last fight at UFC 41 against Gan McGee on February 28, 2003. Dantas has notable wins in Brazilian jiu-jitsu competition over Rodrigo "Comprido", Gabriel Gonzaga, Fabrício Werdum, "Marcelinho" Garcia, Demian Maia, Bruno Bastos, Fernando Augusto “Tererê”, Marcio "Corleta", and others
He is a 3 times world champion in Brazilian jiu-jitsu, the 2002 champion in the open division Brazilian Championship, a 5 times Rio de Janeiro jiu-jitsu champion, the 2007 champion of de ADCC trials in Brazil, the Brazilian Teams Champion at Gracie Barra team, 3 time champion of Brazil X United States of America jiu-jitsu, 3 time Pan-American jiu-jitsu champion, the 2000 United States of America Jiu-jitsu champion, 5 time champion of the open division of Copa Café Jiu-jitsu in MIguel Pereira - Rio de Janeiro, among other championships.
