Cosmetic dentistry is not advisable for people who do not have good dental hygiene.
This is according to Professor Robin Seymour, a leading periodentologist and advisor to Dentyl Active.
Professor Seymour said: "Poor oral hygiene will lead to gum disease, and if not treated this disease will destroy the supporting structures of the teeth.
"The result is that teeth will become loose and could well require extraction. Such tooth loss would make any cosmetic work a waste of time and money."
His comments follow the publication of the latest Adult Dental Health Survey.
The paper, which looked at dental health in 2009, found that visible decay in adults in England has fallen by a fifth since the last survey in 1998.
Furthermore, the proportion of adults who had no natural teeth has fallen in the last 30 years, by almost a quarter in England and by more than a third in Northern Ireland and Wales.