have you noticed that swimmers who swim competitively have very white teeth?
They spent at least 3 hours a day training and as they open their mouths to breathe when they swim, the chlorine which has bleaching properties will whiten their teeth.
Therefore, the longer they are competitive swimmers, the whiter their teeth will be. haha.
just a trivial thought.
.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment