Where teeth fit trees? (4)

I believe the answer is:

gums

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This might be a double definition.

'where teeth' is the first definition.
'gums' can be an answer for 'teeth' (thesaurus). I am not certain of the 'where' bit.

'fit trees?' is the second definition.
'gums' can be an answer for 'trees?' (gum is a kind of tree). I'm not sure about the 'fit' bit.

Can you help me to learn more?

(Other definitions for gums that I've seen before include "Teeth are set in them" , "Smug around the mouth" , "Trees" , "Glues" .)

I've seen this clue in the Sydney Morning Herald.

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