Interestingly, other related products
(Listerine Ultra, Equate Antiseptic, and CVS Antiseptic Mouth Wash), while showing substantial reductions, were not as efficient as Listerine Antiseptic (Table 3). These three products were unable to show a reduction of greater than 99.99% with 30‐s contact time. Equate required 2‐min contact time to show a greater 99.99% reduction.]
I believe quite often medical research is the end result of general public questions, experiences, pressure, etc.