Ache = Pain in a tooth.
Consider a scenario for how this may have happened:
Example: I was eating too much candy until I felt a toothache!
A broken tooth = A cracked tooth.
Consider a scenario for how this may have happened:
Example: I was happily eating popcorn while watching a movie until all of a sudden I felt a broken tooth!
Braces = Dental tools that help correct problems with your teeth.
Consider a scenario for when you may need braces:
Example: I was playing baseball until a ball hit me in the mouth and I needed to fix some of my braces!