A caution is sounded about sucking not because we have a million bacteria in our mouth-because these million bacterias can not do as much damage as the snake venom-but because we may have blisters or open wounds, bleeding gums etc.,in the mouth, which means we have openings into which the poison may ingress, and the saviour may ultimately become the victim in no time. For this reason the boys are usually told not to suck poison and spit it out if they are not sure about the condition of their mouth. Bacterias can be dealt with but not venom after it gets into the bloodstream.
Snakebite Treatment: First Aid Information for Snakebite
If the snake was venomous, the person will be given anti-venom treatment.
A tetanus shot may be given, depending on date of last injection.
Snakebite Causes, Symptoms, Treatment - Snakebite Diagnosis - eMedicineHealth
The most common symptoms of all snakebites are overwhelming fear, which may cause symptoms such as nausea and vomiting, diarrhea, vertigo, fainting, tachycardia, and cold, clammy skin. Television, literature, and folklore are in part responsible for the hype surrounding snakebites, and people may have unwarranted thoughts of imminent death.
Dry snakebites, and those inflicted by a non-venomous species, can still cause severe injury. There are several reasons for this: a snakebite may become infected with the snake's saliva and fangs sometimes harboring pathogenic microbial organisms, including Clostridium tetani. Infection is often reported with viper bites whose fangs are capable of deep puncture wounds. Bites may cause anaphylaxis in certain people.
In such cases the bite and suck is going to cause more harm, than it being left alone.
I am worried that "educated" people are recommending such out dated and useless remedies. Please read up the available literatures, in this day and age of information India has the highest mortality due to snake bites (and ignorance).
Sucking out venom, either by mouth or with a pump, does not work and may harm the affected area directly. Suction started after 3 minutes removes a clinically insignificant quantity—less than one thousandth of the venom injected—as shown in a human study. In a study with pigs, suction not only caused no improvement but led to necrosis in the suctioned area. Suctioning by mouth presents a risk of further poisoning through the mouth's mucous tissues. The well-meaning family member or friend may also release bacteria into the persons wound, leading to infection.
Snakebite - Wikipedia, the free encyclopedia
The Million Death Study puts it in a nutshell: “Snakebite remains an underestimated cause of accidental death in modern India. Community education, appropriate training of medical staff and better distribution of antivenom, especially to the 13 states with the highest prevalence, could reduce snakebite deaths in India.”
http://www.thehindu.com/sci-tech/health/in-search-of-a-cure/article3588735.ece