MOSCOW — Yekaterina Tkalenko brushes her teeth three or four times a day – especially after drinking enamel-insulting tea or coffee – has them professionally cleaned twice a year and carries floss as if it were as vital as an inhaler. She recently spent nearly $1,000 to have her teeth whitened.
“When I look at a person, no matter who it is, the first thing I look at is his or her teeth and their sm ...
