Tooth whitening film, process of manufacturing thereof and a method of using such a film

A tooth whitening film comprising:

• a dental bleaching agent comprising hydrogen peroxide present in a total amount of 0.01% to 35% by weight in a hydrogen peroxide-polymer complex comprising a hydrogen peroxide-polyvinyl pyrrolidone complex present in a proportion of from 0.01 to 80% by dry weight of the tooth whitening film;
• one or more polyphosphates in a total amount of from 3% to 10% by weight, said one or more polyphosphates comprising:
• one or more cyclic polyphosphates of formula (II) in an amount of from 3% to 6% by weight:
• wherein a is a whole number from 3 to 10 and M is selected from one or
• more of the group comprising hydrogen and an alkali metal;
• and
• one or more linear polyphosphates of formula (III) in an amount of from 3% to 4% by weight:
• wherein b is a whole number from 2 to 5 and M is selected from one or more of the group comprising hydrogen and an alkali metal;
• one or more water soluble film-forming polymers in a total amount of 40% to 95% by weight;
• one or more plasticizers in a total amount of 0.1% to 15% by weight;
• and
• one or more emulsifiers in a total amount of 0.1% to 10% by weight, wherein the film has a thickness from 50 μm to 500 μm.