IviSmile London ® is rated 2 out of 5 in the category health and beauty shop. Read and write reviews about IviSmile London ®. The IVISMILE Teeth Whitening Kit has been designed to deliver maximum results in 15 days, with each application being only 30 minutes. Our key ingredients ensure there’s no pain or sensitivity caused throughout the process while delivering guaranteed results of at least 3 shades whiter teeth.