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Increased probing depths, receding gums, and mobility of teeth are significant indicators that a patient may require periodontal therapy. These signs suggest that there is underlying gum disease or periodontal issues that need to be addressed.

Increased probing depths indicate that there is inflammation in the gums, resulting in the loss of attachment between the gum tissue and the teeth. As the periodontal disease progresses, gums may begin to recede, leading to exposure of the tooth roots and increasing the risk of tooth sensitivity and decay. Additionally, mobility of teeth is a clear sign that the supporting structures of the teeth, including the bone, are compromised, which is a critical concern that periodontal therapy aims to resolve.

The other options do not reflect the need for periodontal therapy. Bright white teeth and the absence of sensitivity may reflect good aesthetics and dental health, but they do not provide information on the health of the periodontal tissues. A perfectly aligned bite and no history of gum disease suggest good dental health and do not imply any current need for periodontal therapy. Lastly, dental hygiene improvements and frequent cleanings indicate proactive oral care, but they do not necessarily signify that periodontal therapy is needed unless accompanied by the signs mentioned in the correct answer.