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Yellowing of teeth, gingivitis, periodontitis (gum disease), tooth loss

We break exact linear dependency between the three explanatory variables (i.e., cohort = period age) and deal with under-identification by grouping birth cohorts into frequently used 5-year intervals, and, after confirmation of a curvilinear relationship, treat smoking as a quadratic function of age 30

Irregular bleeding or amenorrhea Mirena IUDs can affect regular bleeding patterns, resulting in irregular bleeding, spotting, amenorrhea and similar concerns

The association between electronic-cigarette use and self-reported oral symptoms including cracked or broken teeth and tongue and/or inside-cheek pain among adolescents: a cross-sectional study