Traditionally, dentists use an instrument they call the “explorer” to find cavities. That’s the instrument they poke around with in your mouth during a checkup. When it “sticks” in a tooth, they look closer to see if they find decay.
Many dentists are now switching to the diode laser, a higher-tech option for detecting and removing cavities. The laser can be used to determine if there is decay in the tooth. The dentist can then choose to watch the tooth, comparing the levels at the next visit, or advise that the cavity be removed and the tooth filled.