Answer
Wa `alaykum As-Salamu waRahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
There is nothing wrong with your mother having an artificial tooth permanently implanted.
Answering your question, we would like to cite the following fatwa published on www.islamqa.info:
There is nothing wrong with implanting an artificial tooth with a ceramic crown in place of a broken tooth, whether the implant is permanent or temporary.
There is also nothing wrong with leaving it in place after a person dies; there are no Shar`i reservations about burying a person with an artificial tooth.
The artificial tooth does not have to be removed during wudu’ or ghusl, as some people think, because it is sufficient to rinse out the mouth.
The scholars of the Standing Committee for Issuing Fatwas were asked: Is removing the teeth and replacing them with new teeth regarded as changing the creation of Allah?
They replied:
There is nothing wrong with treating damaged or faulty teeth with something which will remove the harm they cause, or extracting them and replacing them with false teeth, if there is a need for that, because this comes under the heading of permissible treatment to remove something harmful; it does not come under the heading of changing the creation of Allah as the questioner understands it, because what is meant by the fitrah in the verse “Allah’s fitrah (i.e. Allah’s Islamic Monotheism) with which He has created mankind. No change let there be in khalq‑illah (i.e. the religion of Allah ‘Islamic Monotheism’)” (Al-Rum 30:30] is the religion of Islam. (Fatawa al-Lajnah al-Da`imah, 25:15)
It also says (25/57):
There is nothing wrong with having your teeth treated by a dentist who specializes in dealing with deformities and changing faults by adding artificial teeth, because the Prophet (peace and blessings of Allah be upon him) said: “Yes, O slaves of Allah, seek medical treatment, for Allah has not created any disease but He has also created it cures – or its medicine – except one disease.” They said: O Messenger of Allah, what is it? He said: “Old age.” At-Tirmidhi said: Similar reports were narrated from Ibn Mas`ud, Abu Hurairah, Abu Khuzamah from his father, and Ibn `Abbas.
The late Sheikh Ibn `Uthaymeen (may Allah have mercy on him) was asked: Is it permissible to use false teeth in the mouth when the natural teeth fall out and there is a need for that?
He replied: It is permissible, if a person’s teeth fall out, to replace them with false teeth, because that is removing a fault. The Messenger (peace of Allah be upon him) gave permission to one of the Companions (may Allah be pleased with him) whose nose had been cut off to use a nose made of silver, but it began to smell bad, so he gave him permission to use a nose made of gold, so he used a nose made of gold. Similarly, if the teeth fall out, then one may use false teeth instead, and there is nothing wrong with that. (Fatawa Nur ‘ala al-Darb)
Allah Almighty knows best.