It's possible, but it depends on a combination of factors:
- Scalp health
- General overall oiliness/dryness
- Overall thickness
- And most importantly: What you are willing to tolerate
I go a week between washes, sometimes two. I have three shampoos, Nizoral, Head and Shoulders 2-in-1 fragrance free shampoo, and Head and Shoulders fragrance free shampoo.. When the Nizoral and 2-in-1 are used up, I do not intend to replace them. I am probably one of the few people here who does shampoo only, I am unsure how other hair would fare on that. I'm probably one of the chattier people who does shampoo only, the rest are more likely lurking or not talking about it.
My scalp is healthy (no SD, etc), but I sometimes accidentally injure it from scratching (dermatographia). That is part of why I use Head and Shoulders fragrance free. The absence of fragrance reduces the risk of itching from the fragrance, and the presence of pyrithione zinc soothes the itching. I even sometimes use it as a body wash because I have not yet purchased zinc bars (I am waiting for my health care flexible spending account to kick in for next year so that I can purchase it with tax-free cash because it is for dermatographia).
My hair is neither especially dry nor especially oily overall. The ends are a bit on the dryer side and could probably benefit from more moisture, but they're not so dry that I am concerned as it's not a damage risk in my opinion. After a week, my hair is visibly oily, but it is not especially dirty. You can easily tell I haven't washed it in at least a day after the third or so day, but unless you're familiar with wash stretching I don't think you could accurately guess how many days. Nobody has ever commented on it, not even my very picky mother. I personally think it looks fine--I think slightly oily hair looks nicer than freshly shampooed hair anyway.
As for overall thickness, this is probably more relevant based on how your roots/scalp hair behave when oily from sebum. I can get my scalp hair to sort of "fluff up" in a sort of weird way using the sebum, so someone with thin hair whose sebum is similar could get away with it fine, otherwise you would likely want thicker hair to avoid the appearance of it being glued to your head.
If the oily appearance bothers you, the sebum can usually be distributed with your hands (I find hands more effective than boar bristle brushes or horn combs). I usually wear my hair up or in a braid. I will take it down periodically throughout the day and put it back up because I am prone to fidgeting.
Overall, I'm ok with the look of it, but not everyone would be if it were their hair, and that is what I mean by "what you are willing to tolerate". It's easier for me because I don't like washing my hair (plus showering daily is bad for condition anyway because it increases risk of itch irritants), so I am willing to tolerate a lot more than most people would.
On very rare occasion I will apply coconut oil rather lightly to the length and ends (from about shoulders down, sometimes chin down) or aloe vera to all of it (including scalp area). This is rather rare, probably close to 6 times a year for the coconut oil and maybe every month for the aloe vera (the frequency of the latter depends on if I'm concerned about frizz, I usually am not). I mean to oil more frequently but I usually forget.
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