[quote=@Halo]
<Snipped quote by Makky>

I think they're called mamelons. 

[img]http://www.oralanswers.com/wp-content/uploads/2011/04/mamelons_on_teeth_are_wearing_down.jpg[/img]
[/quote]

Are they natural? I always assumed they were like that because of tooth decay or chip damage.