Rpzrdmsx Sujatha

It’s a good question, really. Normal ice is just frozen water, yeah? When it warms up, it melts into a puddle of water. So it gets everything wet.

But dry ice is different. It's solid carbon dioxide. It doesn't melt into a liquid at all. It turns straight from a solid block into a gas. This process is called sublimation.

So, because it never makes a wet puddle, people call it 'dry' ice. It stays dry as it disappears. It's also proper cold, something like -78 degrees C

It’s a frustrating problem, and you're not imagining it. The main reason is actually about blood pressure. When you lie down to sleep, more blood flows to your head. This increases the pressure inside your tooth’s pulp, the sensitive core filled with nerves. If that area is already inflamed or infected, the extra pressure squeezes on those nerves, causing the pain to spike.

There's also a psychological factor. During the day, you’re busy and distracted. At night, when it's quiet and you're trying to relax, your brain has nothing else to focus on but that throbbing ache. It’s definitely your body's way of telling you to book a visit with a dentist as soon as you can.