Dental caries (tooth decay) is a process that causes localized destruction of tooth tissue. It starts with demineralization of the hard tissues until it progresses and cavitates. It’s cause is multifactorial, so caused by: diet- frequency and type of consumption, frequent snacking and high sugar content, plaque- amount and acidity. The longer the plaque is there, the more acidic it becomes. Saliva- flow and composition. Lower flow has lower buffering system and less ions to remineralise the teeth. Tooth resistance- exposure to remineralising agents such as fluoride and other helpful minerals.