Significant pain reduction and lack of the vibrations give advantage to LASER cavity preparation. The ideal treatment should be fast, painless and effective. Discomfort of the patient and tendency to protect hard dental tissues can lead to insufficient debridement of the carious lesion, inadequate obturation and failure of the restoration. A carious lesion is usually removed using hand instruments and rotary burs.
Understanding of laser physics and laser-tissues interaction for specific wavelength is required to predict the accomplishment of laser treatment.

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