Hello!
I need help to spell and say "Strength and Health" or "To Strength and Health"
I know strength is Neart and health is Sláinte and I got the Google translation but I don't trust it lol! The type of strength I mean is like mental and physical I guess.
Thank you for your help!

David

Instead of looking for translations of words in Irish on Google, I suggest that you have a look at the Teanglann.ie website as well as the New English-Irish Dictionary (www.focloir.ie)
Neart, for example, probably is the word you're looking for, but you can check and refine your search there.

www.teanglann.ie/en/eid/strength

www.focloir.ie/en/dictionary/ei/strength

The single words you found are correct. Combined into what you want, you'd have:
Neart agus Sláinte
Strength and Health

The word agus is often abbreviated, both in writing and speech, and here are the alternatives:
Neart is Sláinte
Neart 's Sláinte

The choice is up to you, and can be based on space needs (especially for a tattoo) or just the way it sounds (as often happens in songs and poems).

There's another word for strength, treise, which can be used for things other than physical strength. If you want to use that, you can just replace the word neart with treise in the phrases above. In other contexts, there might be changes needed to the word, which is a reason for caution in using a dictionary (Irish grammar can be complicated).

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

How do you pronounce "Neart 's Sláinte"?
I'd think such an abbreviation is only possible after vowels