My gums hurt.

His teeth have strong dentin, making them less prone to cavities.

Toothed whales are a type of marine animal, and as the name suggests, they have teeth.

He is listening to music using Bluetooth.

When he eats an apple, he uses his incisors to bite it off.

He is conducting research on the radula of mollusks.

The trailing edge of this airplane has a very unique shape.

After school, we study at the library.

He suffered a minor contusion on his occiput.

He sneaked into the school through the back gate.