Wow, i do not live in the us and have never come across this Novamin desensitizing toothpaste. Although, i would have loved to experience a first hand use as sensitivity is one of the commonest causes of patients presentation to the dental clinic. I personally suspect probably there is a health risk the product posed to the users probably leading to its withdrawal from circulation as i gathered online that this novamin mimics the activity of high potency neuroleptics (antipsychotic drugs). Thanks for the enlightenment @reviewsatrandom