To be clear, I am cheering for BLT and hoping they are rewarded for their pioneering work in oral probiotics, but they are not unique. Consider the ProBiora3 product made and sold in the US (https://evoraoralprobiotics.com/). Their research track record is nowhere near as impressive as BLIS's and it's not clear whether their bacterial strains produce similarly beneficial bacteriocin-like inhibitory substances or whether their product relies simply on competition and population dynamics, but at this stage what matters is whether you can become the best-recognised brand and sell more than your rival.
That said, things still look very promising for BLIS. They have the longer track record and their proprietary K12 and M18 strains appear to be preferred ingredients for other probiotic manufacturers that blend their own mixtures (e.g. Hyperbiotics ProDental and NowFoods OralBiotic). They're in a good position if the concept of oral probiotics takes off.