Excuse me for the formulation hereinafter:
I thought only the Americans could be that stupid – it should be a well known fact, that rinsing after toothbrushing with a toothpaste used, is necessary.
1. It is not a toothpaste that cleans your teeth.
2. The two main purposes of a toothpaste are a) cosmetic – cleaning the teeth and freshening the breath, b) therapeutic – reducing the amount of plaque and possibly healing.
3. The most of cleaning is done mechanically, not chemically. Therefore, as you surely have noticed, you need to brush your teeth and not only to apply a toothpaste.
4. Chemically, a toothpaste contains mainly abrasives, surfactants and fluorides. The first two of them basically finish their work during the cleaning process, the fluorides may continue after, but as you might get overdosed, resulting into dental fluorosis (look it up), this fact is usually enough to rinse.
5. Toothpaste is generally not intended to be swallowed – it may cause nausea or diarrhea.
6. Think of the remaining toothpaste in your mouth as of the soap that you use to clean your hand – the bacterias remain there and by not rinsing after cleaning, it all goes with your saliva down your digestive tract.
7. Your saliva itself is protecting your teeth against pathogenic microorganisms by raising the potential of hydrogen to alkaline values (6.5-7.4). That is why people with low production of saliva usually have problems with teeth.
8. There is no "protective coat" and do not believe in something just because it was said by a doctor.