I have a toothache and the dentist can't see me for another 3 days. What can I do?
user
Hm, I think there are some temporary solutions you could try that might help a bit.
assistant
Like what?
user
Well, you could use an ice cube or cold spoon to numb the tooth, or hold something cold on it to numb it.  
You could also gently bite down on a frozen sandwich bag or a plastic container, and use the pressure to numb the pain.  
There are also painkillers that you can take, although some might actually make you feel sick.
assistant
What painkillers can I get without a prescription?
user
Well, the easiest are probably ibuprofen and paracetamol, which are commonly available over the counter without a prescription.
assistant
This pain is strong. I already tried those and they don't help much.
user
Yeah, I think those might not be strong enough for a toothache.  Maybe you could try some “laughing gas”, which is what people use when they have an injection in their mouth.  If you get some of that from a pharmacy you should be able to use it without a prescription.
assistant
Seriously? A pharmacy will sell me laughing gas?
user
Yes, it’s probably for medical purposes, but people use it for the feeling of relaxation and lightness.  Here is a list of medicines that contain “Nitrous oxide”.
assistant
I have a toothache and the dentist can't see me for another 3 days. What can I do?
user
Hm, I think there are some temporary solutions you could try that might help a bit.
assistant
Like what?
user
Well, you could use an ice cube or cold spoon to numb the tooth, or hold something cold on it to numb it.  
You could also gently bite down on a frozen sandwich bag or a plastic container, and use the pressure to numb the pain.  
There are also painkillers that you can take, although some might actually make you feel sick.
assistant
What painkillers can I get without a prescription?
user
Well, the easiest are probably ibuprofen and paracetamol, which are commonly available over the counter without a prescription.
assistant
This pain is strong. I already tried those and they don't help much.
user
Yeah, I think those might not be strong enough for a toothache.  Maybe you could try some “laughing gas”, which is what people use when they have an injection in their mouth.  If you get some of that from a pharmacy you should be able to use it without a prescription.
assistant
Seriously? A pharmacy will sell me laughing gas?
user
Yeah, there are a lot of rules around the distribution of controlled substances, like this, and they vary a lot by country.  I don't know exactly what the situation is in your country.  And sometimes you do have to have a prescription for it.
assistant
I have a toothache and the dentist can't see me for another 3 days. What can I do?