Secondly there are the fixed costs of postage, processing and handling. You don't actually save by buying just one for yourself. It is our experience that most users want spare ones at this price. Saliva is our natural mouthwash. People who do not have sufficient flow of saliva tend to suffer from more dental caries and gum disease.
Bad breath is worst when there is little or no saliva flow.
That is the reason stress and nervousness can cause bad breath. So we have the term ' morning breath '. Yes, no problem. Let us do an experiment. In any morning right after you brush your teeth as usual, stick in a finger to touch the back of your mouth and the back of your tongue.