Here are several possible explanations and how to deal with the problem:
Possible causes of excessive salivation
Health problems:
Inflammation or infection can cause drooling.
Problems such as tartar, tooth decay or damaged teeth may cause pain and drooling.
Diseases such as liver disease, diabetes or digestive system problems can cause drooling.
Strong smells or other environmental stimuli, such as food or new things, may cause salivation.
Excitement: Dogs can drool when they are excited or excited.
Dogs may drool more when they are hot and try to vomit the heat.

Possible solutions
A visit to the vet:

If the salivation continues for a long time or there are other symptoms (such as lack of appetite, pain or a change in behavior), the dog should be taken to the vet for an examination.
Examination of teeth and gums:
Check the condition of the dog's teeth and gums. Teeth cleaning or other treatment may be necessary.
Change in diet:
If the salivation happens while feeding, you can check if the food is suitable for the dog or if there is a food that causes this reaction.

Reducing stimuli:
In cases of environmental irritation, you can try to reduce the surrounding stimuli, such as strong smells or situations that embarrass the dog.
Comfortable environment:
Ensure that the dog stays in a pleasant and comfortable environment, especially on hot days.
attention:
Pay attention to the dog's behavior and record when the salivation happens, this is to help the vet understand the problem better.

Summary
If your dog is drooling profusely, it can be a sign of a variety of problems. It is important not to neglect the symptom and contact the veterinarian for a thorough examination, especially if it is a persistent phenomenon or accompanied by additional symptoms.