Your dentist may use several methods to determine if you have tooth decay, including
- Observation — Some discolored spots on your teeth may indicate decay, but not all of them. Your dentist may use an explorer, a metal instrument with a sharp tip, to probe for possible decay. Healthy tooth enamel is hard and will resist pressure by the explorer. Decayed enamel is softer. The instrument will stick in it slightly. Explorers must be used with caution. Pressing too hard with an explorer can damage a healthy tooth.
- Cavity-detecting dye — This can be rinsed over your tooth. It will stick to decayed areas and rinse cleanly from healthy ones.
- X-rays — X-rays can help your dentist see decay that doesn't show on the surface. However, X-rays are often not accurate in detecting smaller cavities on occlusal (top) surfaces. Current fillings or other restorations also may block the view of decay.
- Laser fluorescence cavity detection aids — These small wands measure changes caused by caries (tooth decay). They are especially useful for pit and fissure areas.