Welcome subyogi!
Isn’t interesting how the body responds to the yoga? It is possible (no guarantees) that your gastric condition is a result of the cleansing effects of the deep work you that you are doing in your body. This same thing actually happened to me within the first 10 days of my yoga practice too. Take it easy in Wind Removing pose. 
Seriously though the compressive effects in your abdomen in this pose should be lessened or avoided when you have diarrhea.
As for the dental problem 2 things spring to mind:
1) it is possible that you are clenching your teeth with the effort as you familiarize yourself with the series and the environment. It is stressful to be in the hot room. It could be that it is a reaction to the stress and something that you will let go now that you are conscious of it.
2) the other possibility is that it is a coincidence. I have no idea of your dental habits but if this is a generalized jaw pain that cannot be localized to one point, if it is diffuse over an area or even over the mouth then it could be that you need to floss your teeth. In other words there is a food or plaque impaction between teeth. Impactions lever the teeth apart and stretch the ligaments (that attach the teeth to the bone) and when the teeth can’t spring back (in their normal suspension role) then you get pain.
You can tell better if it is something to do with flossing if, when you next floss, that you bleed or if there is pain. And just for those of your reading this who have blood or pain on flossing: floss everyday until you get NO more pain and NO more blood. Then you can floss 3-4 times per week. Many people don’t floss because they are told to do it every single day. They miss out a day, then give up.
Just a little extra gratuitous and very helpful dental advice 
Namaste, and keep me posted!
Gabrielle 
