In short, NO.
No-added-sugar drinks and foods still contain sugar so they still count as a sugar attack on your teeth, and can cause tooth decay.
Lots of companies have taken to using the term “no added sugar” to promote a healthy image for their products. The evidence linking sugar consumption with diabetes and obesity is convincing. So less sugar certainly sounds appealing, but this healthy image is misleading when it comes to the health of your teeth.
When talking about the risk of dental decay, the emphasis should not be on whether sugar is added or “natural“, or on the amount of sugar that ultimately is absorbed into your body, but on whether the sugar is “free sugar” available for fermentation by plaque bacteria in the mouth. Tooth decay is caused by plaque bacteria in the mouth fermenting free sugar and producing plaque acid. The acid demineralises teeth causing tooth decay and dental cavities. Therefore more frequent free sugar consumption will lead to longer periods of availability of free sugar for plaque bacteria to ferment into plaque-acid, and so more dental decay, as will longer retention times from sticky foods like dried fruit.
If you wish to avoid tooth decay, try to limit your sugar consumption to mealtimes by avoiding sugary and sticky snacks, and avoiding sugary drinks between mealtimes. Safe drinks to have between mealtimes include still/unflavoured/tap water or sugar-free non-carbonated drinks, and tea/coffee without sugar.
Ideally try to avoid snacking between mealtimes by having good nutritious wholefood meals with slow-release energy like brown pasta, brown rice and other whole grains, fruit, vegetables and legumes. If you must snack, choose healthy sugar free foods like nuts and seeds, sugar free jelly, low fat humus, fruit and vegetables.