Maintaining oral hygiene is very important for overall health.

He is working at the pithead.

Sexual intercourse is one of the basic human desires.

They were having sex in secret.

I found some useful kitchen items at the 100-yen shop.

I bought a new notebook at the 100-yen shop.

He underwent surgery for appendicitis.

His painting is characterized by a pattern of concentric circles.

Borates play an important role in chemical reactions.

This mineral contains carbonate.