* Grammatically: Yes, you can end a sentence with "too." It's perfectly acceptable in many cases, especially when "too" is used as an adverb meaning "also" or "in addition."
* Example: "I like pizza, and she does too."
* Style: However, some people consider it informal or even incorrect to end a sentence with "too." They might prefer to rephrase the sentence:
* Instead of "I like pizza, and she does too," they might say "I like pizza, and she likes it too."
Ultimately, whether or not you end a sentence with "too" is a matter of style and context. There's no hard-and-fast rule against it, but some people might find it less formal or prefer a different phrasing.