bbc news e cigarettes

bbc news e cigarettes San Francisco moves to ban e-cigarettes until health effects known E-cigarettes 'should be on prescription'

Name: bbc news e cigarettes San Francisco moves to ban e-cigarettes until health effects known E-cigarettes 'should be on prescription'
Brand: mhwesg.org.uk
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Chapter 1: Unit1C.13 (2012)

Cigarette Stains on Enamel: The Combined Effect The combined effect of nicotine and tar on tooth enamel is what creates the characteristic appearance of cigarette stains on enamel , a layered discoloration that includes both surface tar deposits and deeply embedded nicotine pigmentation