An injury prone no-name in junior hockey, Breault was never drafted. However the Los Angeles Kings thought enough of his hustle and desire to sign him to a free agent contract the summer of 1988.
Breault spent a couple of years in the minor leagues with AHL New Haven before finally getting his shot at the NHL in 1990-91. Frankie was making quite an impression in his first few games. He scored only once in 17 games while adding 4 assists, but was noticeable in his enthusiastic role on the Kings 4th line.
Breault's stint of success was cut short on December 13, 1990. In a game against the Calgary Flames, Frankie suffered a severe knee injury. The injury was so severe that he missed the rest of the year.
Breault returned to play but was demoted to the minors for most of the next two years. He did get into 10 more NHL games in those two years and scored his second goal, but was never quite the same. Not a great skater to begin with, the knee injury looked like it cost him his NHL shot.
Breault was let go by the Kings in the summer of 1993. He took the opportunity to go to Britain where he played one final season of professional hockey with the Durham Wasps of the British League. He was strong with 23 goals and 40 point in 14 games.