I think they are probably fine just probably getting a little blood and ick in the little hole that they breathe out of when they eat. There is a pic somewhere on here of that. Its actually pretty cool as I had no clue at first about it.

As far as checking for bubbles in the mouth....take a Q tip sideways and open their mouth with it. super easy ....in fact you can probably google it and someone I am sure will have a how to vid on it. Just be sure to hold right behind their head as they will try to wiggle away...(no one likes their mouth pried open. )