White substance used in dental care (4)

I believe the answer is:

talc

I'm a little stuck... Click here to teach me more about this clue!

'white substance' is the definition.
'talc' can be an answer for 'substance' (talc is a kind of substance). I'm not sure about the 'white' bit.

'in dental care' is the wordplay.
'in' says the answer is hidden in the clue.
'TALC' is hidden within 'dental care'.

'used' is the link.

Can you help me to learn more?

(Other definitions for talc that I've seen before include "I may dust" , "Fragrant powder" , "Powdered substance" , "Cosmetic powder" , "Soft white powder" .)

I've seen this clue in the Evening Standard.

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