What is your fastest acting treatment for lows?

I've been having a bunch of stubborn lows that will sit around 2.0-3.5/36-63 for up to an hour even when consuming a lot more carbs than normal. For example, drinking a 591 ml Gatorade with 38g carbs or eating a whole tube of glucose tabs and a juice box. Is there anything that's going to help me spike it a lot quicker? Is there something like glucagon that I can inject because tbh I'm pretty sick of brushing my teeth like 4 times a day because my mouth is a cavity playground with a pure sugar jungle gym?