According to a Fox News article, ?Triclosan is an ingredient in a popular toothpaste that claims to work up to 12 hours to prevent bacterial plaque formation. This ingredient has raised concern because studies have shown it can be an 'endocrine disruptor,' which can lead to hormonal imbalances such as fertility problems and thyroid problems; it is also linked to antibiotic resistance. Even the Food and Drug Administration (FDA) has expressed concern with this ingredient and Johnson & Johnson is removing it from its soap by 2015.?
Alcohol in mouthwash is also reported to pose negative health effects, as the alcohol removes the protection from the teeth caused by saliva. Fox News also reports a link between alcohol and oral cancer.
Whitening paste can also cause harm to the user. According to the report, ?Carbamide peroxide is found in whitening pastes, gels and rinses. The byproduct of carbamide peroxide is urea, which turns into ammonia.?
They recommend using a hydrogen peroxide gel for a real whitening effect, which will whiten the tooth from the inside out, not just the surface layer.