Anyone who may be concerned that teeth whitening treatment might not be effective should study OK! magazine's newest pictures of Katie Price.

The model was spotted at LAX Airport – where she had travelled to get her hair extensions redone – with a smile so dazzlingly bright it contrasted sharply with her black furry hat and coat.

"[Her teeth] seem to be getting whiter and whiter (either that, or Katie's tan is getting darker)," the publication speculated.

Price is believed to have had dental veneers fitted in 2008. She is also known to be a big fan of Botox.

According to the Cosmetic Dentistry Guide, it is a good idea to have a chat with a professional before having teeth whitening treatment in order to discuss what shade they will turn out.

Laser teeth whitening could turn teeth up to ten shades lighter and people with more stained smiles tend to see more dramatic results.