He gritted his teeth to bear the pain.

Rodents are widely distributed around the world.

If you don't get regular dental check-ups, you may develop periodontitis.

If you don't have regular dental check-ups, you may develop periodontitis.

The saber-toothed tiger is a type of extinct mammal.

As for his future, it's unpredictable.

As the proverb 'better safe than sorry' suggests, I recommend getting vaccinated.

He took his failure as 'don't cry over spilt milk'.

There is a spork in my lunch box.

He said '一瞬先は闇', explaining that predicting the future is difficult.