Cantens began his professional career as a math teacher and a basketball coach at the high school and college levels. In 1985, he became the first head coach of Hispanic origin in the NCAA, and one of the youngest, at the age of 25, at
Barry University. Cantens worked as an Assistant State Attorney for the 11th Judicial Circuit of Florida (1995–1998). During his tenure there, he was the Assistant Chief of the County Court Division as well as a felony prosecutor. He was a Director of the Dade County Bar Association (1996-1999) and a Director of the
Cuban-American Bar Association (1997). Cantens was elected to the Florida House of Representatives as a
Republican for
District 114 in 1998 and reelected for two more terms. Cantens was named a Chairman of a legislative committee as a freshman legislator. During his tenure, he served in various leadership positions, including Majority Whip, and was consistently ranked as one of the most effective legislators in the Florida House and was considered a rising star in the Florida GOP. In 2000, then Speaker of the Florida House, Tom Feeney, tapped Cantens to be the sponsor of the concurrent resolution to appoint the Florida electors that would have decided the 2000 Presidential election in Florida had the United States Supreme Court not concluded its rulings in
Bush v. Gore. He also played an integral role in the Florida Constitutional amendment that required parental notification before a minor could have an abortion; legislation to create the Breast Cancer Research license plate as well as legislation to protect victims of sexual battery. Cantens sponsored the legislation that authorized the college of law at Florida International University (FIU) & Florida Agricultural & Mechanical University (FAMU). Cantens has served as an adjunct professor at Miami-Dade College, St. Thomas University School of Law, and Florida State University College of Law, teaching courses in business law, real estate practices, real estate transactions and legal research and writing. == Personal life ==