The New York Times reports on why it is better for people so buy brushes with soft bristles. The reason for this is because hard bristles can cause damages, and plague is soft enough that soft bristles are sufficient.
STICK WITH SOFT BRISTLES Hard bristles damage teeth and gums unless they’re used very carefully. Dentists universally recommend using a soft-bristle brush, said Dr. Howard S. Glazer, a former president of the Academy of General Dentistry, an organization devoted to advocacy and continuing education.
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