A dental guide device (110, 110', 310) for contacting a dental tool to limit the movement of the dental tool in the removal of a predetermined portion of tooth structure from a tooth to be treated in the mouth of a patient, the dental guide device comprising: an inner surface configured for attachment to a first tooth such that the dental guide device is releasably fixable to the first tooth; and a main body attached to the inner surface and comprising: a first guide channel (122A, 322B) extending at least partially through the main body and defining a channel longitudinal axis, the first guide channel being configured for contacting a first flange (152A, 252A, 352B, 352B', 354B, 354B') of the dental tool extending from a shaft of the dental tool to limit a movement of the dental tool and defining a first channel diameter in a first direction perpendicular to one or more directions the channel longitudinal axis extends; an aperture extending entirely through the main body and configured to expose at least the predetermined portion of the tooth to be treated; and a first opening (127A, 327B) extending between the first guide channel and the aperture, wherein the first opening has a first opening diameter that is less than the first channel diameter and the aperture extends beyond the first opening in the first direction, characterized in that the channel longitudinal axis is offset from the aperture. an inner surface configured for attachment to a first tooth such that the dental guide device is releasably fixable to the first tooth; and a main body attached to the inner surface and comprising: a first guide channel (122A, 322B) extending at least partially through the main body and defining a channel longitudinal axis, the first guide channel being configured for contacting a first flange (152A, 252A, 352B, 352B', 354B, 354B') of the dental tool extending from a shaft of the dental tool to limit a movement of the dental tool and defining a first channel diameter in a first direction perpendicular to one or more directions the channel longitudinal axis extends; an aperture extending entirely through the main body and configured to expose at least the predetermined portion of the tooth to be treated; and a first guide channel (122A, 322B) extending at least partially through the main body and defining a channel longitudinal axis, the first guide channel being configured for contacting a first flange (152A, 252A, 352B, 352B', 354B, 354B') of the dental tool extending from a shaft of the dental tool to limit a movement of the dental tool and defining a first channel diameter in a first direction perpendicular to one or more directions the channel longitudinal axis extends; an aperture extending entirely through the main body and configured to expose at least the predetermined portion of the tooth to be treated; and a first opening (127A, 327B) extending between the first guide channel and the aperture, wherein the first opening has a first opening diameter that is less than the first channel diameter and the aperture extends beyond the first opening in the first direction, characterized in that the channel longitudinal axis is offset from the aperture.