Opened Ampulla

Using an opened ampulla after 24 hours is quite dangerous.

The Endopeels carbolic acid will transform into phenol in such case, which will create necrosis and  pain.
To avoid such problem, has been added menthol to the carbolic acid and arachidonic acid from peanut oil, because the patient will feel strong pain which will lead the physician to stop the treatement.
You should know that phenol is too an anaesthetic and that s why it is dangerous as well to cause painless necrosis.

Conclusion : never make economy on the product , otherwise you will get necrosis and patient will never come back