Sonic-FX™ is not the same company as Groupon and, therefore, has no access to your original transaction with them. 

Sonic-FX™ Toothbrushes purchased on Groupon come with our 90-day warranty. If your purchase is within 90-days and you feel that your Sonic-FX™ is not operating properly due to a manufacturer defect, please click here for more information about the warranty from Sonic-FX™.