Ruling on using a screw made of gold for a man, to fix a tooth
Question

                The dentist put a screw made of gold in my tooth, to fix it. Is that permissible or haraam?.
Praise be to Allah.
    The basic principle is that it is not permissible for men to 
    use gold, whether as an adornment or for medicinal purposes, except in cases 
    of necessity. 

    If a specialist doctor thinks that treatment of the tooth, 
    whether by using a “bridge”, filling it or inserting a screw to fix it, can 
    only be done using gold, there is nothing wrong with that. But if it is 
    possible to treat the tooth just as well using some other material, then it 
    is not permissible to use gold, because of the report narrated by ‘Urfujah 
    ibn As‘ad (may Allah be pleased with him) who said: My nose was cut off on 
    the day of (the battle of) al-Kulaab during the Jaahiliyyah, so I had a nose 
    made of silver, but it began to smell bad, so the Messenger of Allah 
    (blessings and peace of Allah be upon him) told me to get a nose made of 
    gold.

    Narrated by at-Tirmidhi, 1770; classed as saheeh by Shaykh 
    al-Albaani (may Allah have mercy on him) in Saheeh 
    at-Tirmidhi

    An-Nawawi (may Allah have mercy on him) said: With regard to 
    the view of the author, that in cases of necessity it is permissible to use 
    gold, this is agreed upon (among the scholars). Our companions said: It is 
    permissible to use an (artificial) nose or tooth made of gold or silver; 
    similarly, putting fillings of gold and silver in teeth is permissible.

    End quote from Sharh al-Muhadhdhab, 1/312 

    It says in al-Mawsoo‘ah al-Fiqhiyyah, 11/121:

    The fuqaha’ are unanimously agreed that it is permissible to 
    use a nose made of gold. The Malikis and Hanbalis, and Muhammad ibn al-Hasan 
    among the Hanafis, and the Shaafa‘is, said: (This also applies to) teeth. 
    And the Shaafa‘is added: fingertips. The Maalikis and Hanbalis also stated 
    that it is permissible to treat a tooth or teeth with gold. The basic 
    principle concerning that is the report about ‘Urfujah ibn As‘ad (may Allah 
    be pleased with him). … And al-Athram narrated from Moosa ibn Talhah, Abu 
    Jamrah ad-Dab‘i. Abu Raafi‘ ibn Thaabit al-Banaani, Ismaa‘eel ibn Zayd ibn 
    Thaabit and al-Mugheerah ibn ‘Abdullah, that they fixed their teeth with 
    gold.

    End quote. 

    It says in Fataawa al-Lajnah ad-Daa’imah (24/70): If 
    the dentist is skilled and thinks that it is better for you to have a tooth 
    made of gold rather than anything else, then it is permissible for you, 
    otherwise it is not. End quote. 

    They also said (24/56): In cases of necessity it is 
    permissible to use gold to make an (artificial) tooth, nose and so on, if 
    nothing else could be used instead. End quote. 

    Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) was asked 
    about the ruling on having gold teeth. 

    He replied: It is not permissible for men to have gold teeth 
    except in a case of necessity, because it is haraam for men to wear gold or 
    use it as an adornment. In the case of women, if it is customary for women 
    to wear gold teeth, there is nothing wrong with that, and she may have her 
    teeth plated with gold, if that is a customary kind of beautification, and 
    does not constitute extravagance.

    End quote from Majmoo‘ Fataawa wa Rasaa’il Ibn ‘Uthaymeen, 
    11/102 

    Based on that: 

    If the doctor who is treating you only used the screw made of 
    gold because nothing else could be used instead, or because it is better for 
    your teeth, there is nothing wrong with that. Otherwise it should be 
    removed, unless doing so will cause harm, in which case there is nothing 
    wrong with leaving it. 

    And Allah knows best.