Carex is a fluoride containing varnish with the following characteristics except-
0.3 - 0.5  ml of varnish equivalent to 6.9-11.5 mg F is required to cover the full dentition Application is done first on the lower arch and then on the upper arch Contact between varnish and tooth surfaces for about 2 hours is maintained for  prolonged  interaction  between fluoride and enamel Before carex application, teeth are dried but not isolated with cotton rolls