Combine the two sentences using the conjunction "but".
He ate breakfast, but he didn't brush his teeth.
He ate breakfast. He didn't brush his teeth.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Combine the two sentences using the conjunction "but".

### Input:
He ate breakfast. He didn't brush his teeth.

### Response:
He ate breakfast, but he didn't brush his teeth.