Brushing the top of your tongue will not create any permanent change in the texture of your tongue. The tongue heals rapidly.
B- Bacteria
Bacteria
Chemistry
It depends on weather you develop an infection from teh bacteria. There are naturally occuring bacteria on our skin all the time.
Bacteria
Bacteria
bacteria
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Spores
No it can not; you must be infected by the bacteria in order for it to develop.
The average toothbrush should be replaced every three months. If one brushes their teeth twice per day, you could say that toothbrush would be good for about 180 brushes. It's also a good idea to replace a toothbrush if you develop a bacterial or viral infection before the three month mark because any remaining germs on the brush could continue to make you sick when you use it.
I think it is possible that you can develop a kind of power similar to clairvoyance.