Folks who grind their teeth while sleeping rely on custom-fitted guards for prevention. For sellers of those guards, the complication is the custom-fitting. It requires an exact teeth impression, which presumably calls for an in-person visit.

But not if the seller is Pro Teeth Guard, a San Diego, California-based online dental lab that sells made-to-order teeth guards via ecommerce. Its impressions-by-mail process facilitates custom manufacturing — and satisfied customers.

I recently spoke with JP Ji, Pro Teeth Guard's president, on production challenges, customer service strategies, marketing, and more.