Dentist have disclosing tablets that are chewed to teach/give feedback on the effectiveness of tooth brushing. Is there a disclosing agent, that for example, can be sprayed on before showing? This might be handy for alzheimers patents.

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    This could also be helpful for someone who is caring for a patient who is unable to bathe themselves. – L.B. Jun 19 '17 at 17:04

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