<prompt> Stannous fluoride concentration used in topical fluoride is:821.2312  <response>: Stannous fluoride has been used at 8 and 10 concentrations in solutions equivalent to 2 and 2.5 fluoride. Although the 10 solution is usually used for adults and 8 for children, there is no evidence of an actual clinical difference between the two. However, the most commonly used is 8 stannous fluoride preparation.Essentials of preventive and community dentistry Soben Peter 5th edition 