Combine the two sentences using the conjunction "but".
He ate breakfast. He didn't brush his teeth.
He ate breakfast, but he didn't brush his teeth.
Complete the following task based on the instruction and optional input provided.### Instruction:
Combine the two sentences using the conjunction "but".

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

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