In the first place, we would like to stress that our body is a trust from Allah. We must protect and preserve it. Therefore, it is not permissible for us to alter or tamper with our physical faculties unnecessarily. However, if there is a need to repair a damaged part of the body such as a fractured tooth, then there is nothing wrong with that, as the aim of Islam is to keep the Muslim away from all sources of harm, whether psychological or physical.
As for crowning the tooth, it is not forbidden in Islam, as it means repairing something that is broken. 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. The same applies to tooth veneer as you stated.
the artificial tooth does not have to be removed during wudoo’ 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 of Allah (i.e. the religion of Allah __ Islamic Monotheism)” [al-Room 30:30] is the religion of Islam.”