Because some people enjoy the bitter taste, (mostly people enjoy the taste of like black coffee) check out my music on sound cloud btw, type sydneysrequiem and you should find me :)
1 Take vitamins
3 Wash his hands
4 Cover his mouth when coughing or sneezing
5 Stay in his room and avoid common areas of the hous
Well if you already have the silver stuff on your tooth the only way to get it out is if your tooth falls out or if the stuff scrapes off...or you could just lower the amount of sugar intake you have.
Hope I could help!!