The quartic curve given by the implicit equation
 |
(1)
|
so-named because of its resemblance to a tooth.
The bicuspid curve has cusps at 
and 
.
The horizontal tangents are located at 
, and the vertical tangents at 
, 
, and 
, where 
is a polynomial root.
The bicuspid with 
has approximate area
 |
(2)
|
and approximate perimeter
 |
(3)
|
