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Treatment effects were compared by repeated-measures analysis of variance

Tobacco Stains On Teeth Dr Changjie Guo May 18, 2018 1 min read Updated: Oct 22, 2025 The nicotine and tar in tobacco can easily stain on surfaces of teeth or into cracks on enamel and pores in dentine, causing a yellow brown or black discoloration

My contribution to the Advent Calendar was that in an era of optimization, we need to remember the power of having fun at work in order to create extraordinary results

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