The present invention provides a method for dental cutting including the steps of providing a dental unit water line irrigation system, the dental unit water line irrigation system including a container surrounding a solution chamber； providing a lubricant for use in the dental unit water line irrigation system, the lubricant defining a composition including 10 to 25% by weight of ethanol； 5 to 25% by weight of glycerol； 10 to 25% by weight of xylitol； 0.5 to 5% by weight of a nonionic surfactant and emulsifying agent； 0.15 to 0.5% by weight of a plurality of flavoring agents； and 45 to 60% by weight of water； and selectively operating the water line irrigation system to express the lubricant onto a dental cutting site.
