Now Playing: Easier Treatment for Head Lice

Now Playing: Taste your way around Disney's Animal Kingdom this month

Now Playing: Controversy surrounds sentencing of Baylor student accused of rape

Now Playing: Accused Russian agent reaches plea deal

Now Playing: Sarah Hyland reveals serious health struggles, past suicidal thoughts

Now Playing: Ohio woman accused of planning mass murder at bar

Now Playing: Trump to meet Democrats to avoid shutdown

Now Playing: LeBron and Wade square off for last time

Now Playing: Facial recognition tech rolling out in animal shelters

Now Playing: Man alerted to life-threatening problem on his Apple Watch

Now Playing: Sarah Hyland reveals 2nd kidney transplant, depression

Now Playing: Simone Biles opens up on taking anti-anxiety medication

Now Playing: Instagram unveils it's first-ever gift guide, sourced from users

Now Playing: Spice Girls rally around Mel B after her bad fall, surgery

Now Playing: What to know about the new strategy to prevent holiday overeating

Now Playing: Women having heart attacks wait longer to get help: Study

Now Playing: Tiki Barber reveals he is joining 'Kinky Boots' on Broadway

Now Playing: White House scrambles to find chief of staff

Now Playing: Hero officer rescues kids from burning building

Now Playing: NYPD under fire over video showing cops prying baby from mother's arms