Smileo is rated 3.8 out of 5 in the category dental clinic. Read and write reviews about Smileo. Smileo is fast, safe and easy teeth whitenint system for all kinds of yellow or stained teeth caused by coffee, tobacco, tetracycline or other coloring ingredients.\n,Smileo is fast, safe and easy teeth whitenint system for all kinds of yellow or stained teeth caused by coffee, tobacco, tetracycline or other coloring ingredients.