▁a ▁ha re ▁lip ▁or ▁c left ▁pal ate , ▁( or ▁both ) ▁can ▁result . ▁ ▁The ▁nas ol ab ial ▁fol ds ▁are ▁the ▁deep ▁cre ases ▁of ▁t issue ▁that ▁extend ▁from ▁the ▁nose ▁to ▁the ▁sides ▁of ▁the ▁mouth . ▁ ▁One ▁of ▁the ▁first ▁signs ▁of ▁age ▁on ▁the ▁human ▁face ▁is ▁the ▁increase ▁in ▁prom in ence ▁of ▁the ▁nas ol ab ial ▁fol ds . ▁ ▁Function ▁ ▁The ▁mouth ▁plays ▁an ▁important ▁role ▁in ▁e ating , ▁drink ing , ▁breath ing ▁and ▁speaking . ▁ ▁Inf ants ▁are ▁born ▁with ▁a ▁su ck ing ▁ref lex , ▁by ▁which ▁they ▁instinct ively ▁know ▁to ▁su ck ▁for ▁n our ishment ▁using ▁their ▁lips ▁and ▁j aw . ▁The ▁mouth ▁also ▁helps ▁in ▁che wing ▁and ▁bit ing ▁food . ▁ ▁For ▁some ▁disabled ▁people , ▁especially ▁many ▁disabled ▁artists , ▁who ▁through ▁ill ness , ▁accident ▁or ▁con gen ital ▁dis ability ▁have ▁lost ▁de xter ity , ▁their ▁mouth s ▁take ▁the ▁place ▁of ▁their ▁hands , ▁when ▁typing , ▁text ing , ▁writing , ▁making ▁draw ings , ▁paint ings ▁and ▁other ▁works ▁of ▁art ▁by ▁man eu ver ing ▁br ush es ▁and ▁other ▁tools , ▁in ▁addition ▁to ▁the ▁basic ▁or al ▁functions . ▁M outh ▁pain ters ▁hold ▁the ▁br ush ▁in ▁their ▁mouth ▁or ▁between ▁their ▁teeth ▁and ▁man eu ver ▁it ▁with ▁their ▁tongue ▁and ▁che ek ▁mus cles , ▁but ▁mouth ▁painting ▁can ▁be ▁str