Saliva is the best natural defence against decay. The acid from bacteria can be neutralised by saliva. A reduced flow of saliva (dry mouth) can increase your risk of decay. Causes might include:

• Medications that you may be taking that may have a drying effect in the mouth
• Excessive intake of caffeine. Caffeine is found in coffee, tea, chocolate and cola drinks. It draws fluid from the body and reduces saliva.
• Working in a dry environment and not rehydrating often enough
• Some specific diseases or conditions such as Sjogren’s syndrome
• If you have a constant dry mouth, you should consult your dentist to find the cause.