Hi Margo,
Thank you so much for sharing your feedback, and we're really sorry about your experience. We completely understand how disappointing that is, especially when you were seeing results and the light is such an important part of the whitening process.
We take this seriously, and we'd love to help make this right for you. Please contact our Customer Care team at contact@gurunanda.com with details about what happened, and we'll do our best to find a solution.
We appreciate your patience and your willingness to give our product a try.