Ay, alam ko yan! One of my mum friends has the same situation with her 1-year-old, super sensitive sa lasa, konting galaw lang ng toothbrush nasusuka na agad. It's actually normal for some babies to have a stronger gag reflex or be mas particular sa textures and tastes, kaya don't worry too much! Try using a softer toothbrush or even just a wet cloth to clean their teeth para less irritating, at pwede ring try different toothpaste flavors (some babies prefer the mild ones talaga). Since she's also gagging easily with regular food, mas okay siguro mag-check with your pedia just to rule out anything, pero honestly maraming bata na ganyan at lalampas lang nila ito as they grow, every baby lang talaga ang pace. Salamat sa pag-share, and rooting for your LO!