“…Six studies were conducted in Brazil (Colussi et al, 2017; Agostinho et al, 2019; Miotto et al, 2019; Colaço et al, 2020; Silveira et al, 2020; Nascimento et al, 2021) and two in China (He et al, 2012; Lu et al, 2017), while one study each was carried out in India (Appukuttan et al, 2016), New Zealand (Broughton et al, 2012), Iran (Ghazanfari et al, 2017), United States (Kizhner et al, 2011), and Sweden (Oghli et al, 2017). The methods used to assess halitosis were the Etiquette Checker (Ghazanfari et al, 2017), organoleptic method (Kizhner et al, 2011; He et al, 2012; Lu et al, 2017), self‐report (Broughton et al, 2012; Appukuttan et al, 2016; Colussi et al, 2017; Oghli et al, 2017; Agostinho et al, 2019; Miotto et al, 2019; Colaço et al, 2020; Nascimento et al, 2021), or a combination of self‐report and organoleptic measures (Silveira et al, 2020). The instruments used to assess the quality of life were the HALT questionnaire (Kizhner et al, 2011; He et al, 2012; Ghazanfari et al, 2017; Agostinho et al, 2019; Silveira et al, 2020), OHIP‐14 (Broughton et al, 2012; Colussi et al, 2017; Lu et al, 2017; Miotto et al, 2019; Colaço et al, 2020; Nascimento et al, 2021), OHIP‐49 (Oghli et al, 2017), and GOHAI‐ADD (Appukuttan et al, 2016).…”