Scientists in Japan have created a microscopically thin film that can coat teeth to prevent decay or whiten them.

The film is made from hydroxyapatite, the main mineral in tooth enamel.

The material is transparent and becomes invisible, once it’s placed on the tooth, but can be made white for use in cosmetic dentistry.

Researchers are essentially aiming to create artificial enamel and hope to use the product to put an end to sensitive teeth, repair damaged enamel and protect teeth.

They say that in 5 or more years, the film could be used in practical dental treatment such as covering exposed dentin (sensitive tooth structure) and could be used cosmetically in 3 years.