For thirty seconds
thirty endless seconds
according to annotation on the bottle for such period of time you should use Listerine
now the question is: HOW WOULD YOU DO THAT???
my record is 15 and I was almost crying
that thing just burns out everything in your mouth
and for another 15 seconds I was running in the bathroom with my mouth open trying to get some cold air in
do people actually do those 30 seconds?
try and let me know