perform DATY the way women LIKE it, rather than the way they play to the camera in porn movies, this will never happen unless you have some kind of congenital defect in your tongue structure, or chiped or jagged teeth that need a dentist's attention.  Most ladies will not volunteer what you are doing wrong, but if you ask them, they are usually happy to guide you.  

PerioMed

My dentist gave me a bottle of fluoride concentrate after having some sensitivity from teeth bleaching; to alternate in my retainer trays.

But, what I use it mostly for now and it works exceptionally well.  Diluted as rinse is antimicrobial and cures irritations in the mouth like eating something too hot (temp) and burning the tongue or roof of mouth.

I found something very similar you can order without a prescription off Amazon.  It has the very same ingredients as my RX stuff.

Madison

to me all the time. Actually, I should say EVERY time. DATY is my fave and a sore frenulum is the cost of giving a spirited tongue fucking. Mine is always sore for 4 or 5 days afterwards. I sometimes wonder what it would cost (or if there would be health risks) to snip the damn thing (a frenectomy?) for better tongue plunging.

It clips over the upper and lower incisors to prevent teeth grinding overnight, but would also serve to prevent your tongue from getting in contact with them.

I have not had that problem, but another more severe problem of bone spurs in my lower neck and upper shoulder blades caused by having my head tilted back and applying pressure.   To avoid this, have the gal sit or lay down at the edge of the bed with her legs over the side of the bed, and you - with a pillow propped below your knees - kneeling on the floor facing her.   It's much friendlier to your neck.

....... Ah fuck! Now I'm going to have to get some beautiful woman here to see if I can replicate that effect.
What A beautiful thing to research.  

Shit..... Open your mouth wider!  
It's not that complicated. SMH

Everytime I go down on a girl I get this the next day. I don’t think it’s the teeth, I think it’s the stretch. (I’m demonstrating alone right now as if I have a pussy in front of me. It’s quite alluring I assure you)  
Either way I feel pretty good about my battle wounds the following day although it can be frustrating and painful. Ibuprofen helps. 👅
~Arianna

....have had sloppy wet moustache before-but never chafed tongue-normally a lot of natural lubricant is created and my tongue seems to ignore the fact that its part of my mouth and my teeth go to sleep... ...honestly once i'm in there,i really dont ever want to leave...its my favorite place to be for a night of sex...

...and it needs more exercise to keep up with the demands of high-octane tongue-fucking!

Before you can get to the "tongue push up" phase, you need a tiny little barbell and then curl your tongue around it -- now lift! and curl! Ok, that's ONE rep -- now drop and give her 50!

Why don't people want to have fun like this in here anymore? Cum ON peeps!!!

and use your tongue to lick it off.  

Strengthens and lengthens your tongue.