The singular form of the word 'teeth' is 'tooth'. The English language sometimes uses different word formations to indicate singular and plural forms, as we see in this example. 'Teeth' is an "irregular" plural form because it doesn't follow the regular rule of simply adding 's' or 'es' to the end of a singular noun to make it plural. This irregularity in English plural nouns, as reflected in 'tooth' and 'teeth', can be seen in a few other words as well, such as 'mouse' and 'mice'. So, when you have just one, you use 'tooth'. When you have more than one, you say 'teeth'. It's just one of those quirky aspects that make the language a fascinating realm to delve into!
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