Researchers have found that a common antibacterial substance found in toothpaste may combat life-threatening diseases such as cystic fibrosis (CF) when combined with a drug.

The study, published in the journal Antimicrobial Agents and Chemotherapy, found that when triclosan -- a substance that reduces or prevents bacteria from growing -- is combined with an antibiotic called tobramycin, it kills the cells that protect the CF bacteria, known as Pseudomonas aeruginosa, by up to 99.9 per cent.