Types and characteristics of bristles: ideal bristles should have appropriate elasticity and hardness, smooth surface, not easy to absorb moisture, easy to wash and dry, odorless and tasteless. Natural bristles come from bristles, with holes at both ends, different diameters, irregular shapes, fast wear, easy to absorb water and soften, difficult to dry, and easy to mold and grow bacteria.
Nylon bristles, with round or flat ends, have good cleaning and massaging effects on teeth, and can produce specifications with different hardness and thickness, with good elasticity, wear resistance, durability and quick drying. But it can't be used after high temperature curling.
At present, the high-quality nylon wire used is less than 0.20 mm in diameter, soft in texture, poor in water absorption, good in resilience and strong in wear resistance, and can enter the adjacent surface and gingival sulcus area to remove the adjacent surface and subgingival plaque. The hardness of high-quality nylon yarn only decreased by 27% after being fully soaked in water.
Introduction of toothbrush
Toothbrush is an indispensable tool for brushing teeth. With the development of modern science and technology, toothbrushes are also improving. Ancient Buddhists used willow branches to brush their teeth, while ancient Europeans used cloth to brush their teeth. China has the earliest history of using toothbrushes. There are two rows of 8-hole hair-planting toothbrushes in the ancient tomb of Liao Dynasty which lasted for 9 years (AD 959).
Similar to modern commercial toothbrushes, toothbrushes were made in Britain after 1780, when the materials used were bone handles and natural bristles from China. In the mid-9th century, toothbrush was patented for the first time in America.
1938 Due to the influence of World War II, bristles were imported from China, so synthetic materials were used instead of natural bristles. Nylon yarn is soft, elastic and easy to bend. In addition, the round head can enter the gingival sulcus to clean gums and teeth, which is beneficial to oral cleaning.