After seeing SN
A330's post, I'll have to go with the first thing that came to mind when I saw this post some days ago...
Without it, we'd all be chewing tree bark or Kibbles 'n' Bits trying to keep out teeth clean.
By the way, EmiratesA345; I think she may have had a (minor) face-lift. still not a bad looking female, in my opinion.
I'd suggest caution when stating such opinions. Never know if it's the man's wife, sister, cousin.... or even his mother you're talking about