Smoking is well known for the yellowing effect it has on teeth. This discolouration is actually stains left by the nicotine and tar found in cigarettes and other tobacco products. Yellowed teeth can be extremely difficult to whiten, depending on how deep the stains actually are and for how long they have been exposed to the various chemicals found in tobacco products. Exposing your teeth to these chemicals weakens the tooth enamel, the protective layer that cannot be replaced, causing teeth to become vulnerable and allowing stains to become deeply set into teeth.
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