Instruct: Classify a review into positive or negative sentiment.
Query: Artic White - poor service

Product support is lacking. Tried the product as instructed - difficult to make the trays as specified. At least two gel packets were received leaking. Caused extra teeth sensitivity -more than I was accustomed to from other products. Contacted the company about returning. It was difficult to make contact and after finally receiving instructions, I returned the remaining product at my expense which was over two thirds of what was received. I never received a refund or a response. I just gave up and wrote it off as a bad experience with a bad company.