Tooth decay
An area where bacteria have weakened the enamel and dentine; it doesn't heal on its own and grows over time.
What it is
Decay starts when bacteria in plaque turn sugar into acids that gradually dissolve the enamel. Once the acid gets through the enamel, decay moves faster through the dentine towards the nerve.
The signs
At first, usually none. Later comes sensitivity to sweet, cold or hot, a dark spot or a hole. When it gets close to the nerve, the pain can start on its own. Decay between teeth shows mostly on X-rays.
What can be done
Small decay is cleaned and rebuilt with a composite filling, in a single visit. Left untreated, it can lead to root canal treatment or extraction. Fluoride toothpaste, cleaning between the teeth and fewer sweet snacks between meals prevent it. More at Fillings and tooth decay.
Reviewed by Dr. Voinea ·
CMDR Romania · Galați University of Medicine and Pharmacy · General Dentistry