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" ... While there are treatments that can be painted on teeth to stop or prevent decay, they often have drawbacks. For example, silver diamine fluoride can be painted on to teeth to stop decay, but it is used sparingly by dentists as it can stain teeth black. Stannous fluoride treatment is also used, but its main role is to kill bacteria indiscriminately, which is not ideal and can promote antimicrobial resistance. ... "