Shaykh 'Abdul 'Azeez ibn Baaz – may Allah have mercy upon him:
Question: What is the ruling of using anesthetic injections in order to clean, fill or pull teeth if a person is having tooth pains and visits the dentist. Does this affect his Fast? If the dentist gives a person an anesthetic injection for his teeth, does this affect his Fast?
Response: Nothing that was mentioned in the question affects the fast, rather all of that is overlooked, and it is upon that person to guard him/herself from swallowing any medicine or blood. The injection mentioned in the question has no affect on the validity of the fast because it does not resemble eating or drinking, so the basis if the validity of the fast.
[Tuhfat al Ikhwaan: P.181, Majmoo' Fataawa wa Maqaalaat Mutanawi'ah: Vol 15]
Shaykh Saaleh ibn 'Uthaymeen – may Allah have mercy upon him.
Question: May Allah be good to you, O Shaykh, the questioner A. H. from Riyadh is asking: concerning the anesthetic that is injected near the tooth during the day in Ramadaan, is it upon me to make up for that day if I take it?
Response: No, because the anesthetic does not invalidate the fast. Local anesthesia only affects the area that is sedated, it does not reach the stomach. So whoever takes a local anesthetic whether it is during an obligated or supplementary fast, then his fast is valid.
[Noor 'ala ad Darb]
The current Mufti of Saudi Arabia; Shaykh 'Abdul 'Azeez Aal ash Shaykh - may Allah preserve him.
…You may ask (O fasting person) about those who need to have a tooth pulled and require anesthesia in the mouth to sedate the area around the tooth that is going to be pulled and so on, this is also harmless (for the fasting person) because it is neither eating nor drinking, it is only a necessary treatment…
Al Lajnah ad-Daa-imah
Question: Does local anesthesia that is unnutritional affect the fast, keeping in mind that the ill person can delay the treatment until nightfall or even until after Ramadan.
Response:There is no harm in giving a fasting person a local anesthetic shot in the mouth or elsewhere for the purpose of treatment because it is not nutritional.
Member: Bakr Abu Zaid
Member: 'Abdul 'Azeez Aal ash Shaykh
Member: Saaleh al Fawzaan
President: 'Abdullah ibn 'Abdullaah ibn Baaz
Anestesia is of different categories:
The First: Local Anesthesia through the Nose.
It is applied by the patient breathing in a gas that affects the nervous system which results in sedation. This type does not invalidate the fast because this gas that enters through the nose does not have a physical form and does not include any nutritious substances.
The Second: Local Chinese Anesthesia (Acupuncture).
It is applied by inserting dry needles in specific sensitive points under the surface of the skin which stimulate nerves/glands to secret a natural form of morphine that is present in the body, and due to this, the patient losses the ability to feel.
This does not affect the fast as long as it is local and not general, and that the secretion does not enter the mouth.
The Third: Local Anesthetic Injections.
They are applied by injecting a fast acting drug through a vein and covers the patients mind in seconds. As long as it is local and not general, it does not invalidate the fast, and because it does not enter the mouth.
The Fourth Type: General Anesthesia.
The scholars differed over it, and scholars of the past discussed it under the topic of the unconscious person; is his fast valid or not?
There are two issues here:
The First: That the person is unconscious for the whole day; he does not waken at all for any part of the day. In this case the person's fast is invalid according to the majority of the people of knowledge.
Their Evidence: The Qudsee Hadeeth:
"He (the fasting person) leaves off food and drink for Me."
So He attributed the abstinence from food and drink to the fasting person, and this is not the case for the unconscious person.
The Second: That the person is not unconscious for the whole day, and this is an area of dispute.
The correct opinion is that if he is conscious for a part of the day then his fast is valid, and this is the opinion of Ahmad and al Shafi'ee.
According to Maalik, his fast is invalid all the same.
According to Abu Haneefah; if he/she awakens before sunset, he/she renews the intention (for fasting) and the fast is then valid.
The preponderant opinion is Ahmad's and al Shafi'ee's, because the intention for fasting took place with a part of the day, and the same opinion is taken for anesthesia.
[Al Mufatiraat al Mu’aasirah – Shaykh Khalid ibn ‘Alee al Mushayqih]