Source: The Great Interpretation of Dreams (Ibn Sirin)
A broken tooth in a dream indicates death, illness, or absence of the relative indicated by the tooth, or it indicates dispute and cutting ties.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A broken tooth indicates paying off a debt or a bad event happening to a relative.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A broken tooth is interpreted as worry and grief. Whoever sees his tooth break will be afflicted with worry.