Listerine Commercial - 1970's?

[Father] My own son - look at him. He hasn't said a word to me in weeks. Am I that square? Do I have bad breath? Why won't he talk to me honey?
[Mother] Dan... try this.
[F] Listerine - I use that for colds.
[M] But it also kills germs that can cause bad breath.
[F] Yeah, but it's so strong - it'll probably last for... hours.
[M and F] Yeah, right.
[F] Ok.

Later that night.

[F] You should have seen the look on that face. I just smiled and walked out.
[Son] Gee Dad, you really were a rebel.
[F] No, well, yeah, yeah. (laughs)

[Voiceover] Listerine antiseptic. Kills germs. Lasts for hours.

from a 16mm print