We used to use well water which doesn’t contain flouride does this increase tooth decay?

Question: We used to use well water which doesn't contain flouride does this increase tooth decay?
- Keywords:
  flouride,
  increase,
  tooth decay
Asked by mollymooo to Deborah, Euan, Maheen, Rob on 22 Jun 2016.
- Deborah Prunty answered on 22 Jun 2016:
  
  Fluoride was added to our drinking water to help prevent tooth decay, as fluoride helps strengthen our tooth enamel. Water that doesn’t contain fluoride, such as well water, has no effect on tooth decay.
  
  It started being added because our diets have changed a lot over recent decades. We eat a lot more sugary and acidic foods and these attack our tooth enamel.
- Maheen Siddiqui answered on 22 Jun 2016:
  
  I don’t think it will increase tooth decay!

Question: We used to use well water which doesn't contain flouride does this increase tooth decay?