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However, if you have poor dental hygiene and severe gum disease, the effect may be minimal

The Reliable Pick Upsides & Downsides Upsides Quiet even on the highest setting Quickly eliminates food smells Designed for big rooms Downsides Requires several filter replacements instead of an all-in-one filter option Specs Noise Level: 23 to 54dB Dimensions: 15.6D x 8.5W x 19.8H Filter replacements: This depends on how regularly you use the purifier and how much pet dander and other factors it's filtering out, but Levoit says it should only need to be changed once a year

Journal of Medical Virology, 93(2), pp.1045-1056

The Bad Sadly, around one billion people around the world smoke