A person who's teeth are curved inward, but are not crooked would most likely be given a retainer. Braces are only used for straightening teeth that are crooked.
The dentist may give a person a retainer if their teeth are curved inward. They would probably not get braces if their teeth are not crooked.
Check wheel bearings.
Rectum
A straight line is one which travels in exactly one direction, never bending or curving.
A curving, soft line looks and feels more romantic than a straight, unvaried geometric line.
It's where you contract your body into a different shape. See if you where standing straight and making a contraction would be curving your back tucking your pelvis inwards and curving your arms the same way as your body. You also might have the need to bend your legs.
the curving of the path would curve more than it is suppose to and the straight path due to the earths rotation would no longer be straight
Possible bad left front wheel bearing. ditto the wheel bearings, get them checked both sides front and rear. This is a serious safety issue.
An ellipse is a conic section, a curving line which is the path of a point that moves in such a way that the sum of its distance from two fixed points is constant.... so no - there are not 4 straight angles in an ellipse, nor any straight bits at all.
A straight ball delivery in bowling is when the player tosses the ball in a relatively straight line towards the pins. This would be in opposition to other delivery styles, namely the curving, spinning delivery most professionals can be seen using.
The outward curving of the lens is said to be a convex lens.
Acceleration means any of these changes to an object's motion:Speeding up (or starting from rest)Slowing down (or stopping)Turning or curving away from a straight line