You can not really prevent disease in general.
However:-
It is possible to prevent specific diseases (eg smallpox) by implementing a worldwide program of vaccination.
It is possible to build sewage systems that prevent contamination of drinking water.
It is possible to teach people about personal hygiene and a healthy life style.
It is possible to implement food hygiene laws.
All these help to prevent diseases and improve the health of a population.
Coffee won't prevent Alzheimer's disease.
Vaccines, such Fluvax, can prevent viral disease.
No, it helps to prevent disease.
Tetanus does not prevent a disease; it is a disease.
Prophy means "to prevent disease". For example a dental prophy is a teeth cleaning done to prevent disease.
No. They definitely help prevent, and can prevent disease, but there is still a possibility you can still get the disease (or pregnant). They do lower the risk a lot though.
goiters
To prevent disease
yes
Cells can cause disease, but can also prevent disease.
You can't prevent it from happening, because it's hereditary.
You can't prevent it from happening, because it's hereditary.