1. The Secret of Bend Recovery Rate

Observing the brushing process under a microscope: PA66 bristles rebound slowly after bending and tend to "flatten" on the tooth surface, reducing cleaning power. The bend recovery rate (10-second rebound angle) of PA612 bristles reaches over 85°, allowing them to continuously penetrate deep into the spaces between teeth. Laboratory data shows that under the same pressure, the cleaning efficiency of PA612 is improved by 40%.

2. Adaptability to the Tapering Process

The "tapered bristles" of high-end toothbrushes require grinding the ends of the bristles to a 0.01mm taper. PA612 has a moderate degree of crystallinity, resulting in round and smooth tips after tapering that do not prick the gums. In contrast, PA66 has excessive crystallinity and easily forms burrs when tapered, while PA6 is too soft and easily deforms after tapering. This is the manufacturing reason why PA612 dominates the high-end toothbrush market.

3. The Natural Advantage of Antibacterial Modification

The molecular structure of PA612 bonds more easily with silver ion antibacterial agents, achieving an antibacterial rate of up to 99.2% (ISO 22196 standard). Tests by an international oral care brand show that after 3 months of use, the bacterial growth on PA612 antibacterial bristles is only 1/8 of that on ordinary bristles.

Tips & Insights:

When purchasing an electric toothbrush, look for the "PA612 Tapered Bristles" label.

For bristle manufacturers, the oral care industry is currently riding the trend of upgrading from "functional" to "experiential." Functional bristles, such as customized antibacterial and color-changing indicator bristles, serve as the key breakthrough points for product differentiation.