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It has never really gone away and has therefore not made a massive comeback, says Jacke, who is the deputy managing director of C:pop, a research centre for popular music and creative industries at the University of Paderborn in Germany

Even though at-home bleaching products usually have a lower concentration of peroxide, if used excessively, it can cause your teeth to become dehydrated and brittle, not to mention overly sensitive, says Casellini

This makes it easier to track consumption and adjust nicotine strength based on what suits you

Study limitations include not being able to adjust for secondhand smoke, marijuana smoke or e-cigarette use