Artificial teeth are of two types. One which is fixed in the mouth and the other which are removable.

If a person did not gargle during ghusl (ritual bath), however, he inserted water in his mouth and drank it.

If the molars (teeth) are filled with gold or silver in such a manner that it cannot be easily removed and replaced, then it will be in the ruling of an actual part of the body. So ghusl will be valid without removing it.

If a person becomes drunk by drinking alcohol, then the wudhu will break. If he does not become drunk at all, then the wudhu will not break.

The second is that chair which has a back for resting and leaning. If someone leans on this backrest and sleeps his wudhu will break.

If during the cataract operation (eye surgery) blood comes out of the pupil but it remains inside of the eye and does not reach the eyelashes or the outside corner of the eye, the wudhu will not break.

If when using an injection to insert (any medicine or) glucose (into the body), a lot of blood (i.e. that amount of blood which would have been able to flow on its own) comes back into the needle,

If the blood removed by the syringe was not enough to flow then the wudhu will not break, but if the blood was in such a large amount that it would have flowed from its spot then the wudhu will break.

Endoscopy is the insertion of a thin tube into the body through the back passage which is used to examine the internal organs. By inserting this, the wudhu will break.

By applying Khidhab (Mehndi) to the hair, no coat (body) [of the dye] remains on the hair, rather only the color remains. Therefore, the presence of such color, does not prevent [the validity of] wudhu and ghusl.