Fact 1: Infection can cause bodily tissues to swell.

Fact 2: An abscess or swelling is caused by an infection in the tooth or gum.

Given the two facts above, answer the question "what can cause a tooth to swell?" with the following options: 
- virus
 - hormones
 - smoking
 - sugar
 - germs
 - acid
 - bacteria
 - abcess


 

        abcess 