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In severe cases, surgery is necessary to remove tartar deep under the gums, or help heal bone or gums lost to the condition

To reduce the effect of bias, we adjusted observations that did not account for more than five confounders, including age and sex, because they were the significant bias covariates identified by the bias covariate selection algorithm 29 (Supplementary Table 7)

[19] During the early stages, a combination of perceived pleasure acting as positive reinforcement and desire to respond to social peer pressure may offset the unpleasant symptoms of initial use, which typically include nausea and coughing

A study that looked at over 500,000 U.S

These devices can contain lithium batteries, which airlines consider a fire risk