Select from the following.
1). virus.
2). hormones.
3). smoking.
4). sugar.
5). germs.
6). acid.
7). bacteria.
8). abcess.
Given those answer options, answer the question: 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, what can cause a tooth to swell?
A:
8).