How does a decayed tooth break?
Tooth decay begins as a small cavity or hole in the tooth due to the destruction of the hard substance of the tooth such as the enamel and dentin. If the cavity is not cleaned and filled at this point it progresses to eat away the rest of the tooth. When a substantial amount of the tooth is “eaten away” by the bacteria, the tooth becomes weak like a shell. This weakened tooth is prone to break or fracture under chewing pressure.