Does tetrasodium pyrophosphate, a tartar control agent, contradict the effectiveness of sensitivity toothpaste?

It seems like this chemical remove calcium deposits to the tooth but in sensitivity toothpaste, calcium may help to block the dentinal tubules.

Just wanted to ask, if a cracked lower molar is held by a composite resin, something like binding the crack together, will there be still movement of the different cracked surfaces when biting?

Yeap, the composite cover the bite surface plus a little bit extend to the side wall of the the tooth. Dentist mentioned about a crack in the files, but doesn't mention more. Wasn't exactly well informed about what actually happened to this tooth during that composite fillings, only recent years went back and ask so the file mentioned very little info other than a crack and a deep filling has been made. Don't remember the dentist said anything about a crown too. He just went ahead and fixed it with composite. There is an L shaped boundary on the tongue side of the tooth wall. Suppose to be boundary between the filling and the tooth I believe and it the boundary is somewhat stained yellow/brown.

Also noticed that this molar has almost no cusps anymore, the dentist removed most of the rear cusps, maybe left just a bit of the front 2 cusps. Supposed to have 5 cusps based on the opposite side molar which is in good condition.

This post has been edited by filage: Apr 23 2021, 11:59 AM

I don't know what kind of crack it was that required a deep composite filling which extends to the tooth wall. There is definitely 1 piece of amalgam on the bite surface which was installed many many years back. Either the amalgam crack or the tooth structure surrounding the amalgam cracked. But the amalgam is still there on the bite surface occupy half of the bite surface, while the other half is the crack-repairing composite.

So not sure whether he removed half of my amalgam away or the amalgam is as it is untouched.

The problematic area now is the composite area, which cannot bite very hard foods. There is a "plane" somewhere on that composite, that just feels pain if pressure is exerted on the right spots/regions.

And the tooth is sensitive usually after a few cycles of sugary/milk/starchy fooods. Occasionally can feel that ouch 'zap' if rinse with tap water. It seems the 'zap' travels downward.

Mostly I can't bite hard foods like biscuits with this tooth, or it will cause the pain when bite at the problem spot.

Previously dentists who looked at the filling said it looks pretty solid and sound, they didn't detected movement when trying to scrape at the filling. They also didn't detected pain by tapping on the tooth. So they didn't advise anything like trying to change the filling.

So what I think is going on might be residue crack under the filling? which may have some movement when biting.

How damaging are microleakage on filling? Are they able to contain big layers of plague inside? Or are they more of just an annoyance with the sensitivity? I asked my dentist about this chemical called methylene blue before, he seems to be unsure of it. Does this chemical shows the leakage spots on the dental fillings?

I believe in addition to possible leak, my tooth my probably still contain residue crack under filling. Or that some softened dentine was left behind, or maybe have softened due to leakage. My index finger apply some downward pressure on the biting surface 'edge'(tongue side), and do a back and forth (lateral) scratching on the composite filling can evoke pain. There seems so be like something weakening beneath the filling. When fingernail passes over the right spot, the pain is felt. I find it less easy to replicate the pain if i just randomly push downward at the area, it's easier to get the pain with back and forth scratching with downward pressure.

Just like an invisible road bump, when passws over it with fingernail it will produce pain

This post has been edited by filage: May 6 2021, 05:08 PM

Hi experts, how does interproximal cavity usually looks like or feels like?

Noticed some weird sensation between my 15 and 16 recently. A sort of sensitivity after flossing.

Brought my dental mirror to check it and saw that there seems to be brown horizontal sort of crack line on the distal of 15 and mesial of 16. The line is horizontal not vertical.

Is this indicates caries or a stress fractures line? Or maybe it has remineralized and stained brown?

https://www.intechopen.com/media/chapter/48...ia/image17.jpeg
It almost looks exactly like this photo I found on google. The brown stain seems like a horizontal line. It quite likely is caries? Will get it checked once MCO is relaxed a bit.

My 27 is buccally tilted and the distal of my 26 keeps having plague and food debris no matter how I brush just won't be able to get it away unless flossing. Any idea how I can improve this area hygiene? Because it's not always practical to floss when one is outside or working hours. And any ideas as to why a 27 molar became bucally tilted?🤔