The Pros and Cons of all on four dentures

https://nanohub.org/members/237094/blog/2019/07/12-companies-leading-the-way-in-malo-smile-usa-elizabeth-teeth-whitening-elizabeth

The process of tooth whitening lightens the colour of a tooth. Tooth lightening can be achieved by either altering the intrinsic colour or by eliminating as well as controlling the formation of extrinsic discolorations.