The Worlds Finest Brushes - Est. 1777 Micro Thin Tetra Tip Bristles Specially developed to massage and care for weakened gums with 6,000 tetra tipped soft and affluent bristles. Kent, 'The world's finest brush maker' since the 18th century is one of the oldest established companies in Great Britain. Founded in 1777, Kent holds a pre-eminent place in the history of brush making, with an unbroken record of excellence in the quality of its products which has been recognized by the granting of Royal Warrant for nine reigns since George III. Kent Crystal is a new toothbrush adopting a tetra tip technology for upper bristles (5,000) to massage sensitive gums and agitate deeply between teeth and into crevices to remove food particles, whereas bottom bristles (1,000) removing plaques, and brushing teeth as clean as crystal.