Diana Trebble (nee Jennings) trained at Kings College London in the late 1940s before going on to take over practices in Ealing and then Minehead.
However, when she died recently, it was found that she had left two-thirds of her estate to the college in order to allow other students to learn as she did.
This amounts to more than £1 million and will be used to create the open Diana Trebble PhD Scholarship.
Head of the Dental Institute Professor Nairn Wilson said: "The Dental Institute is thrilled to receive this most generous gift from the late Mrs Trebble."
King's College London currently trains one-fifth of all dentists in England and Wales and is the largest dental academic centre in the UK.