There are make-at-home mouthguard kits available in the market which require you to heat the product in water and then put it in your mouth untill it sets. But these applications are thinnest where protection is most needed, fit badly, are uncomfortable and might fall out when most needed or even cause choking.
It is always recommended to get your mouthguards made by a professional. We take an accurate impression of your mouth and note how the jaws bite together to make a mouthguard that comfortably fits your teeth.