Is it teeth whitening or tooth whitening because I see both forms?
In the US you hear "tooth whitening," as in: This is a tooth whitening paste. We do a tooth whitening procedure.
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In the US you hear "tooth whitening," as in:
This is a tooth whitening paste.
We do a tooth whitening procedure.
NewguestIs it "teeth whitening" or "tooth whitening", because I see both forms?
As you say, you see both forms, and they're both correct.