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The outer bristles spread out before the center ones
When the bristles at the edges start splaying but the middle still looks fairly straight, is that already a sign the toothbrush head is worn out? I’m also curious whether that pattern can point to brushing pressure or a head shape that doesn’t suit someone’s mouth, rather than just normal wear.
What other visible changes matter, and when would it be useful to ask a dentist or hygienist to watch someone brush and suggest an adjustment?
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