He is sometimes breifly heard saying "Hell" and "Damn" in older videos
In his REALLY old videos (2012 or so), He cursed a lot and to this day, regrets that.
In a live stream video, DanTDM says "sh*t" and "f**k". Although this video wasn't posted on his channel.
In very old videos, Dan says the words "g*ddamn", "son of a b*tch", "c*nt", "f*ck" and "sh*t".
Dan now says "oh my God" a lot in new videos
Dan uses the words "Jackass" and "Oh my God" in the new episode "Addressing my Only Controversy"